Tagasi otsingusse
Bryan, 1992

Origin and Paleoecology of Maastrichtian Rockground and Chalk Facies in Southcentral Alabama

Bryan, J. R.
DOI
DOI10.2307/3514796
Aasta1992
KirjastusSociety for Sedimentary Geology
AjakiriPalaios
Köide7
Number1
Leheküljed67
Tüüpartikkel ajakirjas
Keelinglise
Id10338

Abstrakt

A phosphatic rocky substrate (rockground) has been recognized at the top of the Ripley Formation, near the town of Braggs. The rockground is developed in a coarse-grained sandstone and is associated with a regional unconformity and probable subaerial exposure (68 Ma sequence boundary). The sandstone was subject to high-energy conditions which produced large, well-rounded cobbles. Thus, at some point, the surface was presumably a rocky shore. The rockground later hosted a low diversity epibiont fauna of bivalves, bryozoans, and serpulid worms. Regular echinoids were common.

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