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dc.contributor.author Harrison, Wyman
dc.date.accessioned 2006-08-16T20:36:54Z
dc.date.available 2006-08-16T20:36:54Z
dc.date.issued 1959-09
dc.identifier.citation Harrison, Wyman, 1959, Petrographic Similarity of Wisconsin Tills in Marion County, Indiana. Indiana Geological Survey Report of Progress 15, 29 p., 5 fig. en
dc.identifier.issn 0097-3645
dc.identifier.uri http://hdl.handle.net/2022/273
dc.description Indiana Geological Survey Report of Progress 15 en
dc.description.abstract Two to four till sheets were deposited in Marion County, Indiana by the East White sublobe of the Ontario-Erie major lobe of the Wisconsin ice sheet. Fraction analyses (mineralogy and lithology versus size) were made for 11 till samples from 4 outcrop localities near the corners of Marion County. The composition of each of 16 Wentworth size fractions (between 0 and 32 mm) was determined for each sample. True weight relationships were obtained from the particle-frequency data following experimental determination of the average grain weight for each mineral and rock type in a given size fraction. The fraction analyses were then expressed in weight percent. Correlation of till samples from the four outcrop localities was attempted according to these assumptions: (1) parts of at least one formerly continuous till sheet are present in Marion County, (2) remaining segments of this till sheet crop out at the four localities chosen for study, (3) individual till sheets are homogeneous and distinguishable one from another, and (4) a given till sheet can be ascertained by finding the group of four samples (one from each outcrop locality) that shows the highest degree of textural and (or) compositional similarity. Plotting of the fraction-analysis data on triangular diagrams indicates that the 11 till samples are too similar in texture and composition to satisfy assumption four, and it is probable that assumption 3 is invalid. The pronounced textural and compositional similarity of the till samples implies uniformity of glacial processes throughout the area of investigation and suggests but slight variation in the materials of the source area between successive glaciations. en
dc.description.sponsorship Indiana Department of Conservation en
dc.format.extent 765569 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Indiana Geological Survey en
dc.relation.ispartofseries Report of Progress en
dc.relation.ispartofseries 15 en
dc.rights This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/2.5/ or send a letter to Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 94105, USA. en
dc.subject Glacial Geology en
dc.subject Sedimentology en
dc.subject Till en
dc.subject Petrology en
dc.subject Mineralogy en
dc.subject Stratigraphy en
dc.subject Wisconsinan en
dc.subject Pleistocene en
dc.subject Marion County en
dc.subject Indiana en
dc.title Petrographic Similarity of Wisconsin Tills in Marion County en
dc.type Technical Report en
dc.identifier.coden ICGPA9


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