Activity 5.8 Geologic History of Southeastern Pennsylvania Date: Name: areas are

Question

Activity 5.8 Geologic History of Southeastern Pennsylvania Date: Name: areas are expo sures of 200-220 million-year-old Mesozoic sand and mad that were deposited in lakes, streams, and fields of a long, narrow valley The red-colored areas are bodies of basalt about 190 million years old. Palconoic and Precambrian rocks are more 252 million years old and colored pale brown STUD AREA - 1-5-20km 10 miles rocks Reading Doylestown Mesozoic- Rocks Pottstown sedimentary ocks Paleozoitc rocks Figure A5.8.1 A Based on their geomcturies (as vicwed from abone in map view), what kind of igncous bodies on the map are labeled A? BBased on their geometries (as viewed from above in map view), what kind of igncous bodies on the map are labeled B (more than one answer is possible)? C REFLECT &DISCUSS; If you could have seen the landscape that existed in this part of Pennsyhania about 200 what else would you have seen on the landscape besides million years ago (when the bodies of igneous rock were lana), valleys, streams, lakes, and fields? Explain your reasoning 148

Explanation / Answer

A. The igneous bodies labelled A are the dykes.

B. The igneous bodies labelled B may be sills, plutons and batholiths.

C. Rift Basins, formed parallel to the continental margins, dinosaurs, first birds and mammals existed on the landscape of Pennsylvania 200 million years ago.

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