1 Geo log i cal Quar terly, 2009, 53 (4): A Grallator-dominated tracksite from the Chinle Group (Late Tri as sic), Moab, Utah Mar tin G. LOCKLEY and Gerard D. GIERLIŃSKI Lockley M. G. and Gierliński G. D. (2009) A Grallator-dom i nated tracksite from the Chinle Group (Late Tri as sic), Moab, Utah. Geol. Quart., 53 (4): Warszawa. Two road side lo cal i ties on the north ern fringes of Moab, Grand County, Utah yield pre vi ously un-de scribed Up per Tri as sic ver te brate tracks from the Chinle Group (Rock Point For ma tion). The first lo cal ity, des ig nated the high way 191 site, yields doz ens of small theropod di no saur tracks (Grallator) pre served on a sin gle, fallen slab. The tracks form a monospecific as sem blage pre served as nat u ral casts. The as sem blage is rep re sen ta tive of what has been re ferred to as Rha etic as sem blage II which is dom i nated by small Grallator tracks. In situ Grallator tracks are also de scribed from a nearby lo cal ity, re ferred to as the Mat ri mony Spring site, where they are found in as so ci a tion with the ichnogenus Brachychirotherium. Many other sites with sim i lar, of ten more-di verse, Late Tri as sic ichnofaunas are known from the re gion. Mar tin G. Lockley, Di no saur Tracks Mu seum, Uni ver sity of Col o rado at Den ver, PO Box , Den ver, Col o rado, 80217, U.S.A.; Mar Gerard D. Gierliński, Pol ish Geo log i cal In sti tute Na tional Re search In sti tute, Rakowiecka 4, PL Warszawa, Po land; JuraPark, ul. Sandomierska 4, PL Ostrowiec Świętokrzyski, Po land; - hoo.com (re ceived: June 09, 2009; ac cepted: De cem ber 18, 2009). Key words: Utah, Moab, Chinle Group, foot prints, theropod di no saurs, Grallator. INTRODUCTION The uppermost Chinle Group (Rock Point For ma tion) is yields high con cen tra tions of ver te brate tracks at many lo cal i - ties (Hunt and Lucas, 1992; Lockley et al., 1992a; Lockley and Hunt, 1995). The best doc u mented ex am ples come from the Gate way re gion of west ern Col o rado and the Dirty Devil River val ley re gion of east ern Utah (Gaston et al., 2003; Lockley and Eisenberg, 2006). Rep re sen ta tive slabs and rep li cas from var i - ous sites have been col lected and il lus trated. These show high densities of well-preserved small Grallator tracks sim i lar to Grallator-dominated as sem blages from other west ern re gions including northern New Mexico (Lockley et al., 1993; Hunt et al., 2000) and north east ern Utah (Lockley et al., 1992a). These occur in association with other vertebrate ichnogenera such as Brachychirotherium, Rhynchosauroides, Eosauropus (Lockley et al., 2006b) and Evazoum (Nicosia and Loi, 2003) which were pre vi ously labeled as Tetrasauropus and Pseudo - tetrasaurpus (Lockley and Hunt, 1995; Lockley et al., 2006a). The pur pose of this short pa per is to de scribe two sites from the Moab re gion that have been known for some time by not pre vi ously de scribed. The first site re veals monospecific, high density assemblage of Grallator tracks from the up per part of the Chinle Group, at a lo ca tion just north of the Col o rado River in south ern Grand County, near Moab Utah (Fig. 1). The site pro duced a fallen slab re veal ing sev eral dozen track casts orig i - nat ing from the un der side of an over hang ex posed in a road cut east of high way 191 (Fig. 2A). The sec ond site, re ferred to as the Mat ri mony Spring site, is an in situ out crop, also in the up - per Chinle Group, lo cated on the south side of the Col o rado River and on the south side of high way 128 (Fig. 2D). This lat - ter lo cal ity is about 500 m east of the for mer. On the ba sis of mea sure ments ob tained at the highway 191 site we present preliminary size frequency and locomotor (step and stride) data for the Grallator trackmakers that are use ful for com par i son with other sites, no ta bly the Dirty Devil site (Lockley and Eisenberg, 2006). We also briefly re view the geographic and stratigraphic distribution of similar Grallator as sem blages in the up per Chinle Group and over ly ing Wingate
2 434 Martin G. Lockley and Gerard D. Gierliński Fig. 1. Lo ca tion of the tracksites along high way 191 and 128 on the north ern out skirts of Moab, Utah Note that the large slab from the high way 191 site has been re moved to a NPS stor age fa cil ity For ma tion of the west ern United States, with spe cial ref er ence to lo cal sites re corded in a re cent sur vey. We also note that sim i lar tracksites are dis trib uted re gion - ally (Lockley et al., 1992a; Gaston et al., 2003) and as far a field as Eu rope (Haderer, 1992; Lockley et al., 1996; Lockley and Meyer, 2000). SITE MONITORING AND DESCRIPTION Our re search group has worked in the Moab area for more than 25 years and pro duced nu mer ous pub li ca tions (see Lockley and Hunt, 1995 for sum mary). Due to the large num - ber of known sites many have yet to be doc u mented in the sci - en tific lit er a ture. How ever, some of these yet-to-be-pub - lished sites have been doc u mented in sur veys by our re search group and oth ers. For ex am ple in 2004 we con ducted a Bu reau of Land Man age ment (BLM) spon sored sur vey that re corded the GPS lo ca tions of 60 sites num bered UCD 1 (2004) UCD 60 (2004). To avoid giv ing pre cise GPS co-or di nates we use these des ig na tions to re fer to a few sites dis cussed herein. The locality (UCD ), herein re ferred to as the high - way 191 site (Figs. 1 and 2A), has been mon i tored for more than 20 years, with out for mally be ing de scribed in any sci en - tific jour nal. Oc ca sion ally tracks found on fallen blocks have been res cued. These in clude spec i mens in the Uni ver sity of Colorado at Denver Dinosaur Tracks Museum collection (CU 147, CU and CU 148.4). The site is near the path of the Moab fault caus ing the rock out crops to be frac tured and sus - cep ti ble to col lapse. The rocks that fall to road level are rou - tinely re moved by the high way de part ment. There fore, the site is es sen tially a road cut that is set back some dis tance (~10 15 m) from high way 191. As a re sult of the reg u lar re - moval of ma te rial, there is a wide shoul der be tween the paved road and the rock out crops. In the past this was a pop u lar park - ing spot. How ever, most of the area is within the bound ary of Arches Na tional Park, and signs, now in place, for bid park ing of ve hi cles at this lo ca tion. The site was re-vis ited again in Oc to ber 2008, when we no - ticed sev eral fallen blocks at the base of the out crop. On rec og - nizing several Grallator tracks we re ported the dis cov ery to the Na tional Park Ser vice (NPS) and ob tained a per mit to doc u ment the site. At this time it was de cided that Park Ser vice per son nel would re move the spec i men to a suit able lo ca tion for curation in the NPS sys tem. Due to the lim ited time avail able and the large size of the fallen slab, we con fined our sur vey to pho to graph ing the slab and mak ing a trac ing of the tracks on trans par ent ac e tate film. Prior to pho to graph ing and trac ing the slab we cleaned off dust with a light brush and marked the tracks lightly with white chalk dust in or der to have them show up more clearly dur ing
3 A Grallator-dominated tracksite from the Chinle Group (Late Triassic), Moab, Utah 435 Fig. 2. High way 191 site (A) and close-ups of the whole slab (B) and the one of Grallator tracks (C); view of the high way 128 site (D) Tape in B is 1.00 m com pare with Fig ure 3 for scale photography and tracing (Fig. 2B and C). We sub se quently num bered the all tracks that ap peared to rep re sent in di vid ual trackways con tain ing one or more rea son ably well-pre served tracks that would yield re li able mea sure ments. Wher ever two or more con sec u tive tracks in a trackway were iden ti fied a trackway num ber was des ig nated (Fig. 3) and the length and width of the best pre served tracks and rep re sen ta tive or av er age steps were re corded di rectly from our trac ing (Table 1). The trac - ing, des ig nated T 1341 in the CU Den ver Di no saur Tracks Mu - seum ar chives, was sub se quently re duced to a suit able pub li ca - tion size, and re versed to show the pos i tive as pect cor re spond - ing to the orig i nal foot print im pres sions, rather than the neg a tive as pect of the nat u ral casts (Fig. 3). Sim i lar tracks also oc cur at a nearby lo cal ity (UCD ) known as Mat ri mony Spring, which is well-known lo cally as a nat u ral source of drink ing wa ter lo cated along side high way 128. This lo cal ity, sit u ated on Bu reau of Land Man age ment (BLM) land, is ~500 m from the high way 191 lo cal ity. The Mat ri mony Spring site was mapped by the se nior au thor more than 20 years ago but the map was never pub lished. The track-bear ing sur face is about 9.0 m long and m wide (area ~16 m 2 ). We herein pres ent the site map (Fig. 4). The out crop re veals about 40 rec og - niz able tracks, com pris ing at least 8 trackway seg ments, and a few iso lated tracks, all pre served as deep im pres sions (con cave epireliefs) on the up per sur face of a sand stone bed over lain by red mudstone. Two of the trackways, rep re sent ing a to tal of 9 10 tracks are iden ti fied as Brachychirotherium, and a representative plas ter cast of one of these foot prints is pre served in the CU Den - ver collections as specimen CU (Be cause of the con stant flow of wa ter around this track it was made by sim ply mold ing the im pres sion with clay and then rep li cat ing the clay cast with plas ter in the lab). The re main ing tracks (~30) and trackways (~6) represent tridactyl bi peds best at trib uted to Grallator. The best-pre served tracks are about 8 cm long, with clear, nar row digit traces. How ever, other tracks ap pear larger (~12 cm) and their out lines are less di ag nos tic (Fig. 4). Some tracks also re veal poorly pre served meta tar sal traces, and yet oth ers are mere oval de pres sions with no toe traces to help re veal the di rec tion of travel. Thus, un like the high way 191 as sem blage, the Mat ri mony Spring (high way 128) as sem blage shows vari able, mostly poor to very poor pres er va tion. Nev er the less, it is pos si ble to in fer a Grallator-dominated assemblage with two Brachychirotherium trackways. It is worth not ing that al though this site has fre quent vis i ta tion from tour ists and lo cals avail ing them selves of the fresh spring wa ter, it ap pears from our ob ser va tions that very few peo ple known of the tracks. In any case, re moval of the tracks, would be dif fi cult and pro duce very poor spec i mens, and to date we know of no van dal ism at this site.
4 436 Martin G. Lockley and Gerard D. Gierliński Fig. 3. Map of Grallator tracks on fallen slab, made from trac ing with trans par ent ac e tate film Com pare with Fig ure 2B Ta ble 1 Track and trackway mea sure ments [in cm] Trackway num ber Foot length Foot width Step-stride x x x x x x x x x x x x x x x x x x x x x x x x x x x x x Mean Moab Mean Dirty Devil DESCRIPTION OF THE LARGE HIGHWAY 191 SPECIMEN As shown in Figure 3, the track-bear ing sur face re veals a min i mum of 40 com plete or par tial tridactyl Grallator tracks, pre served as sand stone nat u ral casts on the un der side of a 30 cm-thick sand stone bed. There are two dis tinc tive track-bear ing lay ers sep a rated by only a thin (~1 cm) fine sand - stone unit bounded by very thin claystone drapes. The lower sur face of the lower layer re veals the ma jor ity of well-pre - served tracks and also dis plays many mud cracks. How ever, tracks also oc cur on the up per sur face of this layer, which is the lower sur face of the over ly ing and thicker sand stone bed. How - ever, many of these tracks were made at the same time as those on the lower sur face: i.e., tracks made on the up per sur face reg - is tered as well pre served undertracks, or pen e trated through to the lower sur face giv ing the ap pear ance of true tracks. This can be proved where the thin lower layer is loose show ing sin gle tracks reg is tered on both sur faces. The sur face area of the track-bear ing slab is just about 2.5 m 2 ( m), not in clud ing a small area which was cov ered by an other larger slab. There fore, al low ing for tracks that have been lost due to dam age of the slab me near the edges, the track den - sity is about 20 per m 2. It was not pos si ble to de ter mine the ori en - ta tion of the block by ref er ence to the out crop. There fore no meaningful trackway ori en ta tions can be re corded. We identified 18 trackway seg ments criss cross ing the sur - face from which we could ob tain use ful mea sure ments. As in - dicated in Table 1 tracks range in length from about 6.3 to 11.5 cm with vari able step lengths from 35 to 54 cm (Table 1). Mean val ues are 9.28 cm for track length (N = 18), 5.53 cm for track width (N = 18) and cm for step length (N = 5). As
5 A Grallator-dominated tracksite from the Chinle Group (Late Triassic), Moab, Utah 437 Fig. 4. Grallator trackway seg ments (left and cen ter) from the highway 128, Mat ri mony Spring site (UCD ) shown in the map (right) In set shows lo ca tion of track-bear ing sur face at the con tact be tween sand stone and mudstone units noted be low, these val ues are sim i lar to those re corded from other small Grallator as sem blages in the Late Tri as sic. TRACKMAKER INFERENCES Most au thors agree that Grallator rep re sents a theropod di no - saur, possibly a ceratosaurian di no saur such as Coelophysis. Tracks in the Moab sam ple have a mean foot length and width of 9.28 cm and 5.53 cm re spec tively (N = 18). This size would cor re - spond to a di no saur such as Coelophysis (Colbert, 1989) or a sim i - lar sized theropod (Thulborn, 1990, fig. 5.3). Al though the mean sizes in the Moab sam ple are 9 15% smaller than those re corded from the Dirty Devil site (10.76 and 6.02 cm re spec tively), the dif - fer ences are mi nor, and a Coelophysis or Coelophysis-like trackmaker is a rea son able in fer ence in both cases. As noted by Lockley and Eisenberg (2006) Grallator tracks from a Late Tri as sic site at Lake Powell, prob a bly from a lower Wingate as sem blage, yields tracks in the 6 8 cm size range. These are about 20 30% smaller than the Moab assemblage, and about 30 40% smaller than the Dirty Devil as sem blage. STRATIGRAPHIC AND REGIONAL CONTEXT OF TRACKS The track-bear ing sur faces at the high way 191 and Mat ri - mony Springs sites are as so ci ated with the up per units of the
6 438 Martin G. Lockley and Gerard D. Gierliński Chinle Group re ferred to as the Rock Point For ma tion (sensu Lucas, 1991). In this area the Rock Point For ma tion, con sists of cross-bedded fluvial sandstones alternating with finer-grained mudstone and siltstone. Higher in the se quence the over ly ing Wingate For ma tion con sists of cliff-form ing sand stones com - prised of large scale eolian cross beds, and a few very thin fine grained intervals: i.e., mostly clay drapes. In some ar eas such as the Echo Camp site (UCD ), rich ver te brate track as sem - blages oc cur very near the Chinle Wingate con tact. Tracks are found at many lay ers in the Chinle Wingate Transition zone, and it may be hard to de ter mine the ex act ho ri zon of or i gin of fallen blocks. For ex am ple, an other slab with about 50 Grallator tracks is known from an other lo cal ity (UCD ) just north of high way 191 and a few hun dred metres west of the afore men - tioned Matrimomy Spring site (UCD ). Re gard less of the difficulties of identifying the exact horizon of origin of such tracks, com pli cated in the case of these sites (UCD and UCD ) by the in flu ence of the Moab Fault, it is still pos - si ble to doc u ment the track as sem blages. The local stratigraphy is characteristic of the Chinle- Wingate tran si tion in the re gion: for ex am ple in the Gate way area of West ern Col o rado (Gaston, 2003; Lockley et al., 2004) and other sites in the re gion (Lockley et al., 1992a, 1993; Lockley and Hunt, 1995). Gaston et al. (2003) noted the abun - dance of Grallator tracks in the up per most part of the Rock Point For ma tion, where other ver te brate ichnogenera such as Brachychirotherium, Rhynchosauroides and the enig matic trace Evazoum (Nicosia and Loi, 2003) also oc cur. For ex am - ple, in ad di tion to the monospecific as sem blage of tracks from the high way 191 site (UCD ) Brachychirotherium (CU 148.1) has also been re corded from this lo cal ity. Tracks previously assigned to Pseudotetrasauropus sp. and Tetrasauropus sp. are also typ i cal of this in ter val and are vis i - ble at the Echo sites (UCD ). How ever, these two ichnogenera, originally based on southern African material (Ellenberger, 1972, 1974) have re cently been re stud ied by D Orazi Porchetti and Nicosia (2007) who con cluded that nei - ther ichnogenus has been iden ti fied with con fi dence in the north ern hemi sphere. Thus, al ter na tive names have re cently been pro posed. Pseudotetrasauropus sp. (as pre vi ously used in the west ern USA and Eu rope) is now re ferred to as Evazoum (Nicosia and Loi, 2003; Lockley et al., 2006a) and Tetrasauropus sp. (as pre vi ously used in the west ern USA and Europe) becomes Eosauropus (Lockley et al., 2006b). All these ichnogenera, ex cept Grallator ap pear con fined to the Late Tri as sic, and are so far un known from the Lower Ju ras - sic. Lockley et al. (2004, 2006a, b), noted that the Tri as sic Ju - ras sic bound ary prob a bly lies within the Wingate Formation. The Lower Ju ras sic con tains a dif fer ent suite of tetrapod tracks including Otozoum, Batrachopus and Anomoepus, so far un - known from the Late Tri as sic (Chinle Group) in the west ern United States. Grallator is the only ubiq ui tous ichnogenus that ap pears abun dantly in both the Chinle and Wingate. GLOBAL CONTEXT Grallator is a long-rang ing ichnotaxon and there fore of lit - tle biostratigraphic util ity. How ever, changes in the me dian and max i mum size of tracks in the Late Tri as sic and Early Ju ras sic have been noted. For ex am ple, Haubold (1986, p. 194) re fers to three suc ces sive foot print as sem blages. The old est (I) is a Carnian Norian as sem blage which con tains a di verse ichnofauna which in cludes a num ber of small tridactylous foot prints. The sec ond as sem blage (II) is de scribed as Rha etic, and less di verse, and mainly con sist[ing] of small tridactylous bi peds (grallatorids), but with a few larger tridactyls (Eubrontes). The third as sem blage (III) is de scribed as Lower Ju ras sic and con tains the afore men tioned zonal in di - ces Otozoum, Batrachopus and Anomoepus, and associated abundant Eubrontes and grallatorids. We in fer that the pre pon der ance of small tridactylous bi - peds (grallatorids) at the Moab site likely places it in the Jurassic Triassic tran si tion zone (Rha etic). In this re gion, there are many sites with abun dant small Grallator tracks oc cur ring in monospecific as sem blages. These in clude the re cently-de - scribed and vi su ally-spec tac u lar Dirty Devil site (Lockley and Eisenberg, 2006) as well as sev eral sites in the Gate way (Col o - rado) area (Gaston et al., 2003) and var i ous sites in Eu rope (Haderer, 1992; Lockley et al., 1996). Both the Carnian Norian as sem blage (I) and the Rha etic assemblage (II) contain Grallator and oc cur in the Late Tri as sic Upper Chinle Group. As sem blage II may also oc cur in the basal Wingate, while Grallator may also co-oc cur in as sem - blage III with typ i cal Lower Ju ras sic Tracks. Thus, it is not pos - sible to draw unequivocal biostratigraphic in fer ences from the occurrence of monospecific Grallator assemblages. Nevertheless, monospecific, and there fore by def i ni tion, low diversity assemblages, of small Grallator tracks fit Haubold s as sem blage zone II cat e gory. Haubold (1984, 1986) noted the in crease in the size of tridactyl dinosaur tracks (Grallator and Eubrontes) across the Triassic Jurassic boundary (Lockley and Hunt, 1995; Olsen et al., 2002). How ever, claims that large tracks (Eubrontes) only oc cur above the boundary (Olsen et al., 2002) have been dis puted (Lucas et al., 2005). Thus, al though there is a gen eral trend to wards a pro - gres sive in crease in the max i mum size of tridactyl theropod tracks in the late Ju ras sic and Early Tri as sic the pres ence of as - sem blages with only small Grallator tracks is not an un am big - uous indicator of age. Acknowledgements. Study of the high way 191 site was con ducted un der per mit: ARCH-2008-SCI-0024, and fa cil i - tated by the kind co op er a tion of J. Troutman and V. Web ster from the Arches Na tional Park of fice Moab. The large spec i - men has been as signed: Ac ces sion # ARCH 351. Study of the other sites on BLM land has been con ducted over many years, but was most re cently sum ma rized in a 2004 sur vey co-spon - sored by the BLM.
7 A Grallator-dominated tracksite from the Chinle Group (Late Triassic), Moab, Utah 439 REFERENCES COLBERT E. H. (1989) The Tri as sic di no saur Coelophysis. Mus. North ern Ar i zona Bull., 57: D ORAZI PORCHETTI S. and NICOSIA U. (2007) Re-ex am i na tion of some large Early Me so zoic tetrapod foot prints from the Af ri can col - lec tion of Paul Ellenberger. Ichnos, 13: ELLENBERGER P. (1972) Con tri bu tion la clas si fi ca tion des pistes de vertébrés du Trias: Les types du Stromberg d Afrique du Sud (I). Palaeovertebrata, Mém. Extraordinaire. ELLENBERGER P. (1974) Con tri bu tion la clas si fi ca tion des pistes de vertébrés du Trias: Les types du Stromberg d Afrique du Sud (II partie: Le Stromberg superieur I. Le biome de la zone B/1 ou niveau de Moyeni: ses biocenoses). Palaeovertebrata, Mém. Extraordinaire. GASTON R., LOCKLEY M. G., LUCAS S. G and HUNT A. P. (2003) Grallator-dom i nated fos sil foot print as sem blages and as so ci ated enig matic foot prints from the Chinle Group (Up per Tri as sic), Gate - way area, Col o rado. Ichnos, 10: HADERER F. O. (1992) Ein weitere grallatorider Fährtenrest aus dem Stubensandstein des Starmborgs (Nordwurttemburg). Jb. Geselsch. Naturkunde Wűrtenburg, 147: HAUBOLD H. (1984) Saurierfahrten (2nd Edi tion). A. Ziemsen Verlag, Wittenberg Lutherstadt. HAUBOLD H. (1986) Archosaur foot prints at the ter res trial Triassic Jurassic tran si tion. In: The Be gin ning of the Age of Di no - saurs: Fau nal Change across the Tri as sic-ju ras sic Bound ary (ed. K. Padian): Cam bridge Uni ver sity Press. HUNT A. P. and LUCAS S. G. (1992) Strati graphic dis tri bu tion and age of ver te brate tracks in the Chinle Group (Up per Tri as sic), west ern North Amer ica. Geol. Soc. Am., Ab stracts with Pro grams, 24 (6): 19. HUNT A. P., LUCAS S. G., LOCKLEY M. G. and HECKERT A. B. (2000) Oc cur rence of the dino saur ian ichnogenus Grallator, in the Redonda For ma tion (Up per Tri as sic: Norian) of East ern New Mex ico. In: Di no saurs of New Mex ico (eds. S. G. Lucas and A. B. Heckert). New Mex ico Mus. Nat. Hist. Sc. Bull., 17: LOCKLEY M. G., CONRAD K., PAQUETTE M. and HAMBLIN A. (1992a) Late Tri as sic ver te brate tracks in the Di no saur Na tional Mon u ment area. In: Utah Geol. Surv. Misc. Publ. (ed. J. R. Wil son), 92 (3): LOCKLEY M. G. and EISENBERG L. (2006) A pre lim i nary re port on a spec tac u lar di no saur tracksite in the Chinle Group, Dirty Devil River val ley, Wayne County, Utah. New Mex ico Mus. Nat. Hist. Sc., Bull. 37: LOCKLEY M. G. and HUNT A. P. ( 1995) Di no saur tracks and other fos sil foot prints of the west ern United States. Co lum bia Uni ver sity Press, New York. LOCKLEY M. G., KING M. J., HOWE S. and SHARP T. (1996) Di no - saur tracks and other archosaur foot prints from the Tri as sic of South Wales. Ichnos, 5: LOCKLEY M. G., LUCAS S. G., GASTON R. and HUNT A. P. (2004) Ichnofaunas from the Tri as sic Ju ras sic bound ary se quences of the Gate way area, West ern Col o rado: im pli ca tions for fau nal com po si tion and cor re la tions with other ar eas. Ichnos, 11: LOCKLEY M. G., LUCAS S. G. and HUNT A. P. (2006a) Evazoum and the re nam ing of north ern hemi sphere Pseudotetrasauropus : im pli - ca tions for tetrapod ichnotaxonomy at the Triassic Jurassic bound ary. New Mex ico Mus. Nat. Hist. Sc. Bull., 37: LOCKLEY M. G., LUCAS S. G. and HUNT A. P. (2006b) Eosauropus, a new name for a Late Tri as sic track: fur ther ob ser va tions on the Late Tri as sic ichnogenus Tetrasauropus and re lated forms, with notes on the lim its of in ter pre ta tion: In: The Tri as sic-ju ras sic Ter res trial Tran si - tion (eds. H. D. Har ris, S. G. Lucas, J. A. Spielmann, M. G. Lockley, A. R. C. Milner and J. I. Kirkland). New Mex ico Mus. Natur. His tory Sc. Bull., 37: LOCKLEY M. G. and MEYER C. A. (2000) Di no saur tracks and other fos sil foot prints of Eu rope. Co lum bia Uni ver sity Press. New York. LOCKLEY M. G., SANTOS V. F. and HUNT A. P. (1993) A Late Tri as - sic tracksite from the Sheep Pen Sand stone, Sloan Can yon, Cimarron Val ley, New Mex ico. In: The Nonmarine Tri as sic (eds. S. G. Lucas and M. Mo rales). New Mex ico Mus. Nat. Hist. Sc. Bull., 3: LUCAS S. G. (1991) Re vised Up per Tri as sic stra tig ra phy in the San Rafael Swell Utah. In: Ge ol ogy of East Cen tral Utah (ed. T. C. Chidsey, Jr. ). Utah Geol. Ass. Publ., 19: 1 8. LUCAS S. G., HAUBOLD H., KLEIN H., LOCKLEY M. G., HUNT A., HECKERT A. and THULBORN R. A. (2005) Tri as sic re cords of the theropod foot print ichnogenus Eubrontes. J. Vertebr. Paleont., 25: 85A. NICOSIA U. and LOI M. (2003) Tri as sic foot prints from Lerici (La Spezia, north ern It aly). Ichnos, 10: OLSEN P. E., KENT D. V., SUES H. D., KOEBERL C., HUBER H., MONTANARI A., RAINFORTH E. C., FOWELL S. J., SZAJNA M. J. and HARTLINE B. W. (2002) As cent of di no saurs linked to an irid - ium anom aly at the Triassic Jurassic bound ary. Sci ence, 296: THULBORN R. A. (1990) Di no saur Tracks. Chap man and Hall, Lon don.
Geo log i cal Quar terly, 2009, 53 (4): 471 476 SHORT COMMUNICATION A distinctive crouching theropod trace from the Lower Jurassic of Poland Gerard D. GIERLIŃSKI, Mar tin G. LOCKLEY and Grzegorz NIED WIEDZKI
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