Copy of Fossils & Correlation Lab

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Apr 3, 2024

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Fossils & Correlation Lab Name______ahmad atris___________ Go to the Online Lab 6 Life Forms & Fossils Part A Life As We Know It 1. Solitary rugose corals are known as horn corals 2. Brachiopods are bivalved (two shells), where one valve is typically larger than the other. T/F true 3. What is another name for bivalved molluscs?pelecypods Pelecypods / Arthropods / Bryozoans / stelleroids 4. If a trilobite has a large cephalon, this means it has a big Head / tail / mid-section / eyeball head 5. Some cephalopods are straight or cigar-like in shape (straight nautiloids, orthocones, belemnites). T/F true Part B What are Fossils 1. Which one of the fossils above is a body fossil? A / B B 2. Which one of the fossils above is a trace fossil? A / B A 3. What two types of fossilization are displayed by this Triassic petrified log? Permineralization / carbonization / replacement / vaporization permineralization and replacement 4. This fossil Ginko leaf is an example of carbonization. T / F true 5. What type of fossilization is best represented by this pyritized ammonite fossil? Ionization / carbonization / replacement / vaporization replacement Part C Identifying Invertebrate Fossils 1. Is this fossil colonial or solitary (non-colonial)? Colonial / solitary (non-colonial) colonial 2. What type of symmetry does this solitary fossil possess? Pentameral / bilateral / radial bilateral

3. This fossil has radial symmetry. T / F true 4. Describe the shape/symmetry of this fossil. Bilateral / pentameral / cone-shaped coiled / flat-coiled (planispiral) cone shaped coil 5. Describe the shape/symmetry of this fossil. Pentameral symmetry / flat-coiled (planispiral) / cone-shaped coiled flat coiled 6. This fossil displays pentameral (5-fold) symmetry. T / F true 7. Is this fossil bivalved/similar or bivalved dissimilar? Bivalved dissimilar 8. What type of symmetry does each shell of this bivalved fossil possess? bilateral 9. Is this fossil bivalved/similar or bivalved dissimilar? Bivalved similar 10. What type of symmetry does each shell of this bivalved fossil possess? none 11. Name this fossil. Trilobite 12.Name this fossil. brachiopod 13.Name this fossil. Horn coral 14.Name this fossil. bryozoan 15.Name this fossil. gastropod 16.Name this fossil.

pelecypod/bivalve 17.Name this fossil. echinoid 18.Name this fossil. cephlapod 19.Name this fossil. Tabulate coral 20.Name this fossil. crinoid Part D Fossil Dating 1. When were trilobites most abundant? Early paleozoic 2. Are trilobites alive today? no 3. During what geologic era were brachiopods most abundant? paleozoic 4. During what geologic period were brachiopods most abundant? devonian 5. Are brachiopods alive today? yes

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Figure 6-14. Fossil assemblage and geologic ranges. See the PDF for this diagram HERE 6. Use the fossil assemblage to determine the geologic period age of the rock unit in Figure 6-14. mississippian 7. What is the best single index fossil in Figure 6-14? 3 8. What is the worst single index fossil in Figure 6-14? 1 9. What two fossils yield the most definitive age in Figure 6-14? 3 and 6

Figure 6-15. Fossil assemblage and geologic ranges collected from a shallow marine limestone. See the PDF for this diagram HERE . 10. Use the fossil assemblage to determine the geologic period age of the limestone host rock in Figure 6-15. mississippian 11. What is the best single index fossil in Figure 6-15? archimedes 12. What is the worst single index fossil in Figure 6-15? bellerophon 13. From Figure 6-15, what fossil pair is the most definitive in determining the age of the limestone? Archimedes and Loxonema

Figure 6-17. Sandstone and limestone fossil assemblages and geologic ranges. See the PDF for this diagram HERE 14.Use the fossil assemblage in Figure 6-17 to determine the geologic period age of the Benson Sandstone. pennsylavanian 15. Use the fossil assemblage in Figure 6-17 to determine the geologic period age of the Grant Formation. sulurian 16. After determining the ages of the Benson Sandstone and the Grant Formation, is there a disconformity present? yes

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17. If there is an unconformity, what range of geologic Periods does it span? Silurian to Pennsylvanian 18.What type of unconformity (marked U) exists at the bottom of the stratigraphic column in Figure 6-16? nonconformity 19.From Figure 6-17, what is the best single index fossil for the Benson Sandstone? enteletes 20.From Figure 6-17, what fossil combination is the most definitive in determining the age of the Grant Formation? Platytrophia and atrypa

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