Tagasi otsingusse
Halleck, 1973

Crinoids, hardgrounds, and community succession: The Silurian Laurel—Waldron contact in southern Indiana

Halleck, M.
DOI
DOI10.1111/j.1502-3931.1973.tb01197.x
Aasta1973
KirjastusWiley
AjakiriLethaia
Köide6
Number3
Leheküljed239-251
Tüüpartikkel ajakirjas
Keelinglise
Id10271

Abstrakt

The uppermost surface of the Silurian Laurel Limestone at its contact with the Waldron Shale in southeastern Indiana was a hardground lithified prior to the deposition of the Waldron. Evidence for this conclusion is the presence of attached palmate crinoid roots, auloporid corals, and craniid brachiopods on the Laurel surface; the irregularity of the contact with the Waldron; and a pyritic veneer at this contact. The hardground apparently had a submarine origin. In addition to the attached epifauna mentioned above, algal-sediment ‘clods’ formed on this surface. Some of these accumulated around the crinoid stems, causing them to produce cirral extensions. The resulting community was a crinoid ‘meadow’ with algal growths forming sediment traps around and between the crinoids. Later stages of Waldron Shale deposition led to the development of a soft-bottom community.

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