| Abstract: | The Tippecanoe and Kaskaskia cratonic megasequences in the Iowa area are subdivided into a succession of third-order transgressive-regressive (T-R) depositional cycles of ~1 to 3 m.y. duration. Cratonic deposition in the Iowa area is categorized into two broad-scale facies groupings, each dominated by shallowing-upward patterns: 1) an inner shelf with shallow subtidal to peritidal facies, and 2) a middle shelf dominated by subtidal facies. Relative changes in sea level, as documented in the cycles, are considered primarily to reflect eustatic patterns, but local variations in subsidence history and sedimentation rates complicate interpretations of the eustatic signal. Minor modification of certain sequence stratigraphic paradigms that were developed originally for continental margin settings is suggested for application to the Iowa cratonic cycles. |
| Genre: | Article |
| ProdID: | 70017837 |
| Citation Author: | Witzke, B. J.; Bunker, B. J. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | Witzke B.J. |
| Citation End Page: | 330 |
| Citation Issue: | |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Paleozoic sequence stratigraphy: views from the North American craton |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 24 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | Geological Society of America; Special Paper |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | Relative sea-level changes during Middle Ordovician through Mississippian deposition in the Iowa area, North American craton; 1996; Article; Journal; Paleozoic sequence stratigraphy: views from the North American craton; Witzke, B. J.; Bunker, B. J. |
| Citation Start Page: | 307 |
| Citation Volume: | |
| Citation Year: | 1996 |
| Type: | citation/reference |
| Text: | Relative sea-level changes during Middle Ordovician through Mississippian deposition in the Iowa area, North American craton; 1996; Article; Journal; Paleozoic sequence stratigraphy: views from the North American craton; Witzke, B. J.; Bunker, B. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1996 00:00 -0600 |
| Publisher: | Geological Society of America; Special Paper |
