Terranal Affinities of Iowa Chalks
With the larger perspective of the Cretaceous formations recently opened out to the west of us, between the Missouri River and the Rocky Mountains, the depositional relationships of our Iowa terranes take on new aspect. Above the basal Dakota sandstone, so well represented in our state, all of the g...
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ftunortherniowa:oai:scholarworks.uni.edu:pias-5717 2023-08-20T04:07:04+02:00 Terranal Affinities of Iowa Chalks Keyes, Charles 1926-01-01T08:00:00Z application/pdf https://scholarworks.uni.edu/pias/vol33/iss1/44 https://scholarworks.uni.edu/context/pias/article/5717/viewcontent/043_Terranal_Affinities_of_Iowa_chalks.pdf en eng UNI ScholarWorks https://scholarworks.uni.edu/pias/vol33/iss1/44 https://scholarworks.uni.edu/context/pias/article/5717/viewcontent/043_Terranal_Affinities_of_Iowa_chalks.pdf ©1926 Iowa Academy of Science, Inc. Proceedings of the Iowa Academy of Science text 1926 ftunortherniowa 2023-07-29T22:44:54Z With the larger perspective of the Cretaceous formations recently opened out to the west of us, between the Missouri River and the Rocky Mountains, the depositional relationships of our Iowa terranes take on new aspect. Above the basal Dakota sandstone, so well represented in our state, all of the great black-shale sequence, including the Benton, Pierre, Masuk and other similar divisions, is now regarded as a single provincial deposit, comprised under the title of Assiniboian series. Into this great body of black-shales extend from the shoreward margins huge wedges of terriginous clastics; while from our side, the seaward side,· appear limestones and chalks. lnstead, then, of our being on the eastern shore of the one-time, broad, mediterranean sea, the present Iowa border of these deposits is really originally situated near the middle, and the Cretaceous waters extend far to the eastward, to the present Hudson Bay, and the far shore of present Lake Superior. Thus a large proportion of our Cretaceous deposits, and especially our chalks, present itself in a new sedimental role. Text Hudson Bay University of Northern Iowa: UNI ScholarWorks Hudson Hudson Bay |
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University of Northern Iowa: UNI ScholarWorks |
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ftunortherniowa |
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English |
description |
With the larger perspective of the Cretaceous formations recently opened out to the west of us, between the Missouri River and the Rocky Mountains, the depositional relationships of our Iowa terranes take on new aspect. Above the basal Dakota sandstone, so well represented in our state, all of the great black-shale sequence, including the Benton, Pierre, Masuk and other similar divisions, is now regarded as a single provincial deposit, comprised under the title of Assiniboian series. Into this great body of black-shales extend from the shoreward margins huge wedges of terriginous clastics; while from our side, the seaward side,· appear limestones and chalks. lnstead, then, of our being on the eastern shore of the one-time, broad, mediterranean sea, the present Iowa border of these deposits is really originally situated near the middle, and the Cretaceous waters extend far to the eastward, to the present Hudson Bay, and the far shore of present Lake Superior. Thus a large proportion of our Cretaceous deposits, and especially our chalks, present itself in a new sedimental role. |
format |
Text |
author |
Keyes, Charles |
spellingShingle |
Keyes, Charles Terranal Affinities of Iowa Chalks |
author_facet |
Keyes, Charles |
author_sort |
Keyes, Charles |
title |
Terranal Affinities of Iowa Chalks |
title_short |
Terranal Affinities of Iowa Chalks |
title_full |
Terranal Affinities of Iowa Chalks |
title_fullStr |
Terranal Affinities of Iowa Chalks |
title_full_unstemmed |
Terranal Affinities of Iowa Chalks |
title_sort |
terranal affinities of iowa chalks |
publisher |
UNI ScholarWorks |
publishDate |
1926 |
url |
https://scholarworks.uni.edu/pias/vol33/iss1/44 https://scholarworks.uni.edu/context/pias/article/5717/viewcontent/043_Terranal_Affinities_of_Iowa_chalks.pdf |
geographic |
Hudson Hudson Bay |
geographic_facet |
Hudson Hudson Bay |
genre |
Hudson Bay |
genre_facet |
Hudson Bay |
op_source |
Proceedings of the Iowa Academy of Science |
op_relation |
https://scholarworks.uni.edu/pias/vol33/iss1/44 https://scholarworks.uni.edu/context/pias/article/5717/viewcontent/043_Terranal_Affinities_of_Iowa_chalks.pdf |
op_rights |
©1926 Iowa Academy of Science, Inc. |
_version_ |
1774718504471101440 |