Geography, 13.02.2020 18:50 homeschool0123
While working in the field, you find some sedimentary rocks that include hundreds of fossils of crinoids, numerous brachiopods, and a few trilobites. Realizing that these ancient organisms are some of the first with hard parts, and (when taken as a group) are not very similar to animal communities living today, in which unit of geologic time would you place these rocks?
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While working in the field, you find some sedimentary rocks that include hundreds of fossils of crin...
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