Using Fossils to Date Rocks and Events Activity 3 Course/Section: Date: fossilif

Question

Using Fossils to Date Rocks and Events Activity 3 Course/Section: Date: fossiliferous rock from New York (Fig. A3.1A) ualvze this 1. What index fossils from Fig. 13 are presenti . The overlap in ranges es of the index fossils indicates the age of the index fe Express that age range in terms of the period(s) of the geologic appropriate. Esample: late Triassic to early Jurassic Using the information in Fig 13 as your guide, how old is this rock? informal modifiers like-early·"middle," or-ate" as Express your answer as a range in millions of years D alyze this fosiliferous sand from Delaware (Fig. A3.1B) I. What index fossils from Fig 13 are present? 2. Express the age range of this sandstone in terms of the period(s) of the geologic time scale using informal modifiers like "early. "middle, or late" as appropriate. . Using the information in Fig. 13 as your guide, how old is this rock? Express your answer as a range in millions of years CAnalyze this fossiliferous rock from Ohio (Fig. A3.1C) 1. What index fossils from Fig. 13 are present? geologic time scale, using informal modifiers like "early." "middle," or lase" as 2. Express the age range of this rock in terms of the period(s) of the . Using the information in Fig. 10 as your guide, how old is this rock Express your answer as a range in millions of years. the geologic cros-sertion in Fig, 2 based on it fossils. Which two formations are separated by a disconformity? le discontinuity indicates a gap in the rock record. What is the minimum and maximum amount Figure A31 2. The tme that is not reflected in the rock record in this location? minimum Myr maximum: REFLECT &D; s located? Explain. What geologic event occurred duri

Explanation / Answer

A. 1. acording to the guide 13 , there is two index fossils are present , first one is Mucrospirifer and second one is phacops.

2. range of the Mucrospirifer was from middle devonian to late devonian and Phacos having a range from late silurian to early mississippian.

3. age of this rock should be 422 million years .

B. 1. acording to the guide 13 , there is two index fossils are present , first one is Exogyra and second one is Bacufides.

2. range of the Exogyra was from early jurrasic to late cretaceous and Bacufides having a range from early mississippian to quaternary.

3. age of this rock should be 359 million years .

C. 1. acording to the guide 13 , there is two index fossils are present , first one is flexicalymene and second one is strophomena.

2. range of the flexicalymene was from late ordovician to early silurian and strophomena having a range from middle ordovician to early silurian

3. age of this rock should be 464 million years .

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