Chapter 13: Paleoecology of the Pennsylvanian Period in Illinois and Adjacent States

Weller, J. Marvin

doi:10.1130/mem67v2-p325

Cited by 14 publications

(8 citation statements)

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“…This column is a composite section assembled from the sediments observed in cores collected throughout the area; hence the sedimentary sequence diagrammed on Figure 5 represents an "ideal northern section." Identical techniques have been used to construct the stratigraphie sequence of the members of defined cyclothem types (Weller, 1930;Wanless and Shepard, 1936), including that of the ideal cyclothem (Krumbein and Sloss, 1953, p. 353). (Fig.…”

Section: Figure 3 Ideal Northern and Southern Stratigraphie Sectionsmentioning

confidence: 99%

“…However, a general cyclothem, usually referred to as the "ideal cyclothem" Willman and Payne, 1942;Krumbein and Sloss, 1953;Weller, 1957) has been defined and includes most of the principal members of other cyclothem types. The ideal cyclothem is diagrammed on Figure 5; because of its general completeness, it is used for comparative purposes in this discussion.…”

Section: Ideal Cyclothemmentioning

confidence: 99%

“…The ideal cyclothem is diagrammed on Figure 5; because of its general completeness, it is used for comparative purposes in this discussion. Comprehensive treatment of the geology of cyclothems can be found in papers by Weller (1930), Moore (1931), Wanless and Weller (1932), Wanless (1947), Wanless and Shepard (1936), Weller (1957), Beerbower (1961), Wanless and others (1963), and Swann (1964).…”

Section: Ideal Cyclothemmentioning

confidence: 99%

“…Most likely it was formed by terrestrial (streams and wind) reworking of slightly older marine terrace sands or was derived substantially by solution of the coastal limestone bedrock, which contains some quartz. Member 2 of the ideal cyclothem, a sandy shale that is gradational with the underlying basal sandstone, is regarded as a fluvial piedmont or valley-flat deposit (Weller, 1957) or as an interdistributary deltaic sediment (Wanless and others, 1963;Swann, 1964). This member has no clear counterpart in southwestern Florida, inasmuch as sediment-laden streams do not reach the southwestern coast of Florida; hence coastal fluvial deposits are lacking.…”

Section: Stratigraphie Comparisonmentioning

confidence: 99%

“…Member 9 is the thickest and laterally the most continuous limestone unit of the ideal cyclothem. This limestone is fine-grained and contains an abundant marine invertebrate fauna; it is generally regarded as recording the culmination of the marine phase of the ideal cyclothem (Weller, 1957). Member E of the southern ideal Florida section is a fossiliferous calcilutaceous mud that in lithified form would be the lithologic counterpart of Member 9 of the ideal cyclothem (Fig.…”

Section: Stratigraphie Comparisonmentioning

confidence: 99%

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Modern Coastal Mangrove Swamp Stratigraphy and the Ideal Cyclothem

Scholl

1969

Geological Society of America Special Papers

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The general stratigraphy of the "ideal" cyclothem of Late Paleozoic age can be recognized in a modern succession of sedimentary units underlying the coastal mangrove swamps of southwestern Florida. Because coal deposition is associated with the formation of cyclothems, this stratigraphic similarity has geologic importance with respect to coal formation.The lower part of the succession in Florida consists of nonmarine sediments, the middle part of brackish-water or fresh-water mangrove peat, and the upper part of brackish-water and marine units. This sequence of sediments records a relative rise in sea level. In comparison, the lower part of the ideal cyclothem consists basically of nonmarine units, the central sedimentary member is coal, and the upper units are brackish-water and marine sediments.The ideal cyclothem is thought to have formed in part in a deltaic environment and to record a periodic fluctuation in terrigenous sediment supply and a relative rise in sea level. In contrast, southwestern Florida has essentially no deltas, as most of its paralic sediments are derived from coastal sources. In view of this, the stratigraphic similarity noted above must reflect a partial duplication of sedimentary environments brought about by a relative rise in sea level across a low coastal platform supporting peat-depositing paralic and fresh-water swamps and forests. This conclusion tends to support the point of view that the coal member of some cyclothems formed in a swampy 37 38 ENVIRONMENTS OF COAL DEPOSITION environment penecontemporaneously with a relative rise in sea level. The coal member, therefore, is in part a transgressive unit.

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Section: Figure 3 Ideal Northern and Southern Stratigraphie Sectionsmentioning

confidence: 99%

Section: Ideal Cyclothemmentioning

confidence: 99%