The Microstratigraphy of the Meadville Member of Lodi, Northeastern Ohio: A Lithofacies Analysis

Title:
The Microstratigraphy of the Meadville Member of Lodi, Northeastern Ohio: A Lithofacies Analysis
Authors:
Madof, Andrew S.
Abstract:
During the Lower (Osagian) Mississippian Period, Ohio was about 7 degrees south of the equator in a tropical epicontinental sea at the northwestern edge of the Appalachian foreland Basin. Present day Lodi, northeastern Ohio, lay within the midst of a westward deepening syncline whose sediment was derived from the Acadian uplifts to the east. This sediment, composed primarily of illite and quartz, was deposited about 100 m below sea level in a middle to outer deltaic environment. From the base (Meadville Member) to the top (Armstrong Member) of the strata exposed at Lodi, a general increase in grain size occurs. This upward coarsening trend represents an overall regression that occurred some 345 million years ago. Shale packages and concretionary horizons are indicative of times of quiescence. Sil tstone beds, which are prevalent in the lower 2 m of the strata, represent storm induced channelized grain flows. Paleocurrent data taken indicates that these grain flows, which are upward fining mini-cycles, trended between about N45 degrees E and N66 degrees E. Although historically it was thought that these siltstone beds were uncorrelatable over any distance greater than a few meters, correlation between three beds 95 m apart was achieved based on four concretionary marker beds. Sediment grain-size analysis, macrofaunal identification, and the local correlation of siltstone and concretionary beds (which has lead to the recognition of channelized siltstones) have enabled a Iithofacies analysis to be conducted of the Meadville Member at Lodi City Park.
Citation:
Madof, Andrew S. “The Microstratigraphy of the Meadville Member of Lodi, Northeastern Ohio: A Lithofacies Analysis.” Honors thesis, Oberlin College, 2000.
Type:
Thesis
Degree Level:
Bachelor of Arts
Discipline:
Geology
Degree Year:
2000
Notes:
CLICK THE LINK BELOW TO REQUEST THIS THESIS
Additional Links:
http://www.oberlinlibstaff.com/testform.2.html
PERMANENT LINK:
http://hdl.handle.net/11282/581195

Full metadata record

DC FieldValue Language
dc.contributor.authorMadof, Andrew S.en
dc.date.accessioned2015-10-26T13:38:53Zen
dc.date.available2015-10-26T13:38:53Zen
dc.date.issued2000-05en
dc.identifier.citationMadof, Andrew S. “The Microstratigraphy of the Meadville Member of Lodi, Northeastern Ohio: A Lithofacies Analysis.” Honors thesis, Oberlin College, 2000.en
dc.identifier.urihttp://hdl.handle.net/11282/581195en
dc.description.abstractDuring the Lower (Osagian) Mississippian Period, Ohio was about 7 degrees south of the equator in a tropical epicontinental sea at the northwestern edge of the Appalachian foreland Basin. Present day Lodi, northeastern Ohio, lay within the midst of a westward deepening syncline whose sediment was derived from the Acadian uplifts to the east. This sediment, composed primarily of illite and quartz, was deposited about 100 m below sea level in a middle to outer deltaic environment. From the base (Meadville Member) to the top (Armstrong Member) of the strata exposed at Lodi, a general increase in grain size occurs. This upward coarsening trend represents an overall regression that occurred some 345 million years ago. Shale packages and concretionary horizons are indicative of times of quiescence. Sil tstone beds, which are prevalent in the lower 2 m of the strata, represent storm induced channelized grain flows. Paleocurrent data taken indicates that these grain flows, which are upward fining mini-cycles, trended between about N45 degrees E and N66 degrees E. Although historically it was thought that these siltstone beds were uncorrelatable over any distance greater than a few meters, correlation between three beds 95 m apart was achieved based on four concretionary marker beds. Sediment grain-size analysis, macrofaunal identification, and the local correlation of siltstone and concretionary beds (which has lead to the recognition of channelized siltstones) have enabled a Iithofacies analysis to be conducted of the Meadville Member at Lodi City Park.en
dc.relation.urlhttp://www.oberlinlibstaff.com/testform.2.htmlen
dc.titleThe Microstratigraphy of the Meadville Member of Lodi, Northeastern Ohio: A Lithofacies Analysisen
dc.typeThesisen
thesis.degree.levelBachelor of Artsen
thesis.degree.disciplineGeologyen
thesis.degree.year2000en
dc.description.notesCLICK THE LINK BELOW TO REQUEST THIS THESISen
All Items in The Five Colleges of Ohio Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.