# FORENSIC GEOLOGY GEOLOGIC TIME AND GEOLOGIC MAPS

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1 NAME FORENSIC GEOLOGY GEOLOGIC TIME AND GEOLOGIC MAPS I. Introduction There are two types of geologic time, relative and absolute. In the case of relative time geologic events are arranged in their order of occurrence. No attempt is made to determine the actual time at which they occurred. For example, in a sequence of flat lying rocks, shale is on top of sandstone. The shale, therefore, must by younger (deposited after the sandstone), but how much younger is not known. In the case of absolute time the actual age of the geologic event is determined. This is usually done using a radiometric-dating technique. II. Relative geologic age In this section several techniques are considered for determining the relative age of geologic events. For example, four sedimentary rocks are piled-up as shown on Figure 1. A must have been deposited first and is the oldest. D must have been deposited last and is the youngest. This is an example of a general geologic law known as the Law of Superposition. This law states that in any pile of sedimentary strata that has not been disturbed by folding or overturning since accumulation, the youngest stratum is at the top and the oldest is at the base. While this may seem to be a simple observation, this principle of superposition (or stratigraphic succession) is the basis of the geologic column which lists rock units in their relative order of formation. As a second example, Figure 2 shows a sandstone that has been cut by two dikes (igneous intrusions that are tabular in shape).the sandstone, A, is the oldest rock since it is intruded by both dikes. Dike B must be older than dike C since it is cut by dike C. The sequence of events, therefore, is deposition of sandstone A followed by intrusion of dike B and then dike C. Figure 1. Example of superposition. Layer A was deposited first, layer D was deposited last. Figure 2. Two dikes cutting a sandstone. Dike B is intruded before dike C. -1-

2 As a third example (Figure 3), a sequence of sediments is deposited and then lithified. The resulting sedimentary rocks are deformed (folded), eroded and then covered by an ocean. Subsequent deposition of carbonate shell material leads to the formation of a marine limestone. The sedimentary sequence A through D (oldest to youngest) must have been deposited first. This sequence was then folded and subsequently eroded (erosion surface E). After erosion, marine limestone F was deposited. The erosion surface, E, is an example of an unconformity. An unconformity represents a break in the geologic record either due to erosion of previous material or a period of nondeposition. In this case surface E is referred to as an angular unconformity because the underlying rocks (A to D) are at an angle with respect to the overlying rocks (F). As a final example (Figure 4), consider the case in which a fault developed after formation of a sequence of rocks. In this case rocks A and B are offset by fault D, so they must have been formed prior to faulting. However rock C is not offset so it must have been formed after faulting occurred. Figure 3. Sedimentary units A to D are deposited, lithified, and folded. After the folding the rocks are eroded and at some later time marine limestone is deposited. Figure 4. Fault cutting earlier deposited and lithified rock. The fault is eroded prior to deposition of unit C and must therefore be older than C. Figures 1 to 4 represent what are called sequence of events problems. In studying any geologic area one of the things to know is the order in which the geologic events occurred. This allows us to develop a relative geologic history for the area. A sequence of events problem is found on the next page. -2-

3 For the geologic cross-section (Fig. 5) determine the relative sequence of occurrence for the rocks or events indicated by the letters. Figure 5. Diagram for sequence of events problem Enter the sequence of events in order from youngest at the top of the table to oldest at the bottom. Rock or Event Criteria used to determine the relative position Youngest Oldest -3-

5 Figure 6. The Geologic Time Scale. From Tarbuck, Lutgens, and Pinzke (2003) -5-

6 V. Geologic maps Geologic maps show, for a given area, the types of rocks and their ages. These maps present basic geologic information that can be used in a variety of ways. The most famous geologic map (sometimes referred to as The Map that changed the world ) is William Smith s map of the British Isles (Fig. 7), considered to be the first geological map. The map was published between 1815 and Smith s work was of such high quality that modern geologic maps of the British Isles still bear a great similarity to his original work. Figure 7. William Smith s geologic map of the British Isles ( ) - the map that changed the world. Source: Geological Society of London -6-

7 All geologic maps have a legend that identifies the types of rock in the area, their sequence, and their relative age. The rocks are grouped together into formations (mapable rock units) that may consist of only one rock type or several similar rock types. These formations are then arranged in stratigraphic order and their geologic ages are shown. VI. Geologic maps and forensic science Geologic maps are often used in forensic science to establish the origin of a rock. A common example is the material switch in which rocks are substituted for a valuable commodity. By identifying the type of rock and, in certain cases using fossils its age, one can compare the rock to the lithologies (rock types) that are exposed in the areas where the switch might have taken place. This comparison is done using geologic maps of the areas of interest. Once the location where the switch took place has been identified, further investigation may lead to the perpetrators of the crime. 1. With reference to the Geologic Map of Southeastern Utah, what types of rocks (formation names and rock types) occur in the NE corner of the map area? 2. This problem uses the Geologic Map of the Winnemucca Quadrangle, Nevada (CSI Las Vegas territory). A body is discovered on Hayden Ranch (SW area of map). A bloody rock is found with the body (specimen provided). Identify the rock. Does this type of rock occur anywhere in the area covered by this geologic map (see the Legend)? The answer is most likely yes. Where in the area does this type of rock occur? Do you think the person was killed at Hayden Ranch or might the crime have taken place somewhere else? Explain. -7-

8 3. Refer to the Geologic Map of Washington. A shipment of engine parts from Korea arrives at the Port of Seattle and the containers are transferred to railroad cars and shipped to Detroit. When the containers arrive in Detroit they are found to contain not engine parts but volcanic rocks. A geologist from the University of Detroit is called to the plant. He s done geologic research on rocks from Washington and his observation of the rocks in the crates suggests that they are Miocene volcanic rocks. Could the replacement of the engine parts with the rocks have occurred in Seattle? If so, what was the likely source of the rocks? One of the dock workers lives in Ellensburg. Is he a possible suspect? Explain. -8-

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