Question

multiple - choice 6.25 points
which of the following organisms is used more than most other organisms to help identify strata in rock and sediment that are associated with ocr deposits, because they are indicative of the age of the sediment or rock strata.
stromatolites
dinoflagellates
foraminiferans
ammonites
previous

Explanation:

Stromatolites are ancient structures formed by cyanobacteria and are often used as indicators of the age of rock and sediment layers in the context of geological - time and stratigraphy. Diatoms are single - celled algae, foraminiferans are single - celled organisms with shells, and ammonites are extinct cephalopods. None of these are as characteristic as stromatolites for dating rock and sediment associated with early Earth deposits.

Answer:

A. Stromatolites