CPR

Data: The goal of this assignment is to report and interpret the data collected from the

outcrop near Newport Ohio that contains cyclic sedimentation.

The source material includes the data collected during our fieldtrip to the stratigraphic

section west of Newport, Ohio, descriptions of cyclothems in your textbook, particularly

chapter 11, and a website that does a nice job describing the climate during the

carboniferous and relates it to the rocks and fossils found in West Virginia.

https://www.geocraft.com/WVFossils/Carboniferous_climate.html

Student Instructions

Have your lab notes from the field trip and review the information on cyclothems in your

text. Read the website on Carboniferous climate. While reading these sources contemplate

the layers of strata we observed at the outcrop and how we saw both terrestrial and marine

rocks. Coal, shale with abundant plant fossils, and cross­bedded sandstone are terrestrial

deposits. Limestone and dark grey shales with marine fossils are marine rocks. Shales

interebedded with silt and sandstones that coarsen upward are delta deposits that indicate

that the water depth is slowly shallowing during a regression. This shallowing may be

caused by lowering the sea level or silting up the area with sediments from the southeast

and prograding into the area.

Write a second part of your essay describing the layers we observed at the

outcrop and their cyclic nature. Give an interpretation that tells which

stratigraphic sequence model is most similar to the data you described.

15. Describe each layer independent from any interpretation. It is OK to describe the layers

as a list. Number them 1­12. For each give the color, rock type, fossils and sedimentary

structures, any other information you observed or that you were told to make note of.

16. Did you observe any repetition of strata or rock types?

17. What are your environmental interpretations for each layer? Give an interpretation

that tells which stratigraphic sequence model is most similar to the data you

described.

If you think it is a meandering river sequence, explain by describing the

characteristics from the meandering river sequence that compare favorably with your

data and which characteristics from the prograding delta sequence contrast with your

data.

If you think it is a prograding delta sequence, explain by describing the

characteristics from the prograding delta sequence that compare favorably with your

data and which features from the meandering river sequence contrast with your

data.

18. Which layers that we observed are part of the transgressions and which are part of the

regressions?

19. Define what cylothem is and what causes them?

20. describe how your data are indicative of at least 2 full cyclothem cycles. discuss the

climate of the area during the Carboniferous, and based on your reading from the textbook

and website, conclude what probably caused the cyclicity observed

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