{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/77688"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/77688","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Stratigraphy, Depositional History, and Brachiopod Paleontology of Virgilian Strata of East-Central Illinois","abstract":"The Virgilian outlier, upper Mattoon Formation, in east-central Illinois consists of alternating marine and nonmarine strata divided into eight modified cyclothems: Omega, Shumway, Bogota, Newton, Mint Creek, Greenup, Toledo, and Woodbury. The modified cyclothems are recognized with lower boundaries at top of coal or base of the lowest marine stratum. The perceived stratigraphic succession is revised, incorporating cyclotherms and formal members, and utilizes outcrop and newly acquired subsurface data.","abstract_html":"The Virgilian outlier, upper Mattoon Formation, in east-central Illinois consists of alternating marine and nonmarine strata divided into eight modified cyclothems: Omega, Shumway, Bogota, Newton, Mint Creek, Greenup, Toledo, and Woodbury. The modified cyclothems are recognized with lower boundaries at top of coal or base of the lowest marine stratum. The perceived stratigraphic succession is revised, incorporating cyclotherms and formal members, and utilizes outcrop and newly acquired subsurface data.","abstract_has_math":false,"creators":["Weibel, Carl Pius"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Geology","degree_department":null,"school":null,"contributors":["Langenheim, Ralph L., Jr."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-05-14T15:21:45Z","date_published":"2015-05-14T15:21:45Z","updated_at":"2026-07-22T22:26:11Z","subjects":["Geology","Paleontology"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8823283"],"render_values":[{"text":"(UMI)AAI8823283","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/77688","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Langenheim, Ralph L., Jr."]},{"key":"dc:creator","label":"Author","values":["Weibel, Carl Pius"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-05-14T15:21:45Z","10000-01-01","1988"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Geology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Geology","Paleontology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/77688","(UMI)AAI8823283"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The Virgilian outlier, upper Mattoon Formation, in east-central Illinois consists of alternating marine and nonmarine strata divided into eight modified cyclothems: Omega, Shumway, Bogota, Newton, Mint Creek, Greenup, Toledo, and Woodbury. The modified cyclothems are recognized with lower boundaries at top of coal or base of the lowest marine stratum. The perceived stratigraphic succession is revised, incorporating cyclotherms and formal members, and utilizes outcrop and newly acquired subsurface data.","Cyclothems containing black, fissile shale were deposited in successive environments of (1) local, shallow, tidal lagoon, (2) shallow, nearshore, open marine, (3) offshore, marine, (4) shallow, nearshore, open marine, (5) subaqueous deltaic progadation, and (6) coastal plain progradation. Marine units in cyclothems lacking the shale were deposited in either shallow, nearshore, open marine or in shallow, offshore, open marine environments. Analysis of the Bogota cyclothem indicates slow transgression consisting of a series of progressively more widespread advances with minor retreats.","Limestone petrography indicates diagenesis in successive environments of marine phreatic, saturated meteoric phreatic, and burial environment. Some limestones included diagenesis in mixed marine-freshwater, unsaturated meteoric phreatic, or meteoric vadose environments. Diagenetic sequences are compatible with the inferred depositional environments.","Shumway, Bogota, Newton, and Mint Creek cyclothems correlate with equivalent cyclic sequences in the midcontinent and north-central Texas. Biostratigraphic correlation of 21 brachiopod species, indicates strata above the Omega Limestone Member are middle to upper Virgilian, supporting the extrabasinal, lithostratigraphic correlation. Inability to correlate with cyclic strata in New Mexico and Nevada suggests correlable Virgilian cyclothems are restricted to the craton, or that eustatic fluctuations are not yet discernable in the these platform carbonates. This study supports, in part, the validity of widespread, glacial-eustatic, cyclothemic deposition.","Made available in DSpace on 2015-05-14T15:21:45Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 8823283.PDF: 10138344 bytes, checksum: 37bad25122b4dc880e3707c91ea5a940 (MD5) Previous issue date: 1988","Embargo set by: Seth Robbins for item 78898 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","257 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1988."]},{"key":"dc:title","label":"Title","values":["Stratigraphy, Depositional History, and Brachiopod Paleontology of Virgilian Strata of East-Central Illinois"]}]}],"canonical_facts":{"dc:contributor":["Langenheim, Ralph L., Jr."],"dc:creator":["Weibel, Carl Pius"],"dc:date":["2015-05-14T15:21:45Z","10000-01-01","1988"],"dc:description":["The Virgilian outlier, upper Mattoon Formation, in east-central Illinois consists of alternating marine and nonmarine strata divided into eight modified cyclothems: Omega, Shumway, Bogota, Newton, Mint Creek, Greenup, Toledo, and Woodbury. The modified cyclothems are recognized with lower boundaries at top of coal or base of the lowest marine stratum. The perceived stratigraphic succession is revised, incorporating cyclotherms and formal members, and utilizes outcrop and newly acquired subsurface data.","Cyclothems containing black, fissile shale were deposited in successive environments of (1) local, shallow, tidal lagoon, (2) shallow, nearshore, open marine, (3) offshore, marine, (4) shallow, nearshore, open marine, (5) subaqueous deltaic progadation, and (6) coastal plain progradation. Marine units in cyclothems lacking the shale were deposited in either shallow, nearshore, open marine or in shallow, offshore, open marine environments. Analysis of the Bogota cyclothem indicates slow transgression consisting of a series of progressively more widespread advances with minor retreats.","Limestone petrography indicates diagenesis in successive environments of marine phreatic, saturated meteoric phreatic, and burial environment. Some limestones included diagenesis in mixed marine-freshwater, unsaturated meteoric phreatic, or meteoric vadose environments. Diagenetic sequences are compatible with the inferred depositional environments.","Shumway, Bogota, Newton, and Mint Creek cyclothems correlate with equivalent cyclic sequences in the midcontinent and north-central Texas. Biostratigraphic correlation of 21 brachiopod species, indicates strata above the Omega Limestone Member are middle to upper Virgilian, supporting the extrabasinal, lithostratigraphic correlation. Inability to correlate with cyclic strata in New Mexico and Nevada suggests correlable Virgilian cyclothems are restricted to the craton, or that eustatic fluctuations are not yet discernable in the these platform carbonates. This study supports, in part, the validity of widespread, glacial-eustatic, cyclothemic deposition.","Made available in DSpace on 2015-05-14T15:21:45Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 8823283.PDF: 10138344 bytes, checksum: 37bad25122b4dc880e3707c91ea5a940 (MD5) Previous issue date: 1988","Embargo set by: Seth Robbins for item 78898 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","257 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1988."],"dc:identifier":["http://hdl.handle.net/2142/77688","(UMI)AAI8823283"],"dc:language":["eng"],"dc:subject":["Geology","Paleontology"],"dc:title":["Stratigraphy, Depositional History, and Brachiopod Paleontology of Virgilian Strata of East-Central Illinois"],"dc:type":["text"],"thesis:degree_discipline":["Geology"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:11Z"}