Then study the portion of a geologic map of Pennsylvania below. The green-colore

Question

Then study the portion of a geologic map of Pennsylvania below. The green-colored areas are exposures of 200-220 million-year-old Mesozoic sand and mud 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. Paleozoic and Precambrian rocks are more than 252 million years old and colored pale brown. Based on their geometries (as viewed from above, in map view), what kind of igneous bodies on the map are labeled A? Based on their geometries (as viewed from above, in map view), what kind of igneous bodies on the map are labeled B (more than one answer is possible)? If you could have seen the landscape that existed in this pan of Pennsylvania about 200 million years ago (when the bodies of igneous rock were lava), then what else would you have seen on the landscape besides valleys, streams, lakes, and fields? Explain your reasoning.

Explanation / Answer

A. Area A contains bodies of diabase.

B) Area B contains bodies of basalt

C) Around 200 million years ago, the landscape is one of rolling lowlands consisted chiefly of red sedimentary rock interrupted by hills of diabase, a hard and dark red colord igneous rock. Around 220 million years ago, the North America split off from Western Africa and Atlantic Ocean opened up. A wide period of erosion over the following 200 million years causes the landscape features of Pensylvaniya as today.

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