Geologic And Hydrologic Studies Of The Oligocene - Pleistocene Section Near Lewes, Delaware
| Author(s) | Andres, A.S. | |
| Author(s) | Benson, R.N. | |
| Author(s) | Ramsey, K.W. | |
| Author(s) | Talley, J.H. | |
| Date Accessioned | 2008-04-02T14:27:02Z | |
| Date Available | 2008-04-02T14:27:02Z | |
| Publication Date | 1990-10 | |
| Abstract | Borehole Oh25-02, located about 3 miles southwest of Lewes, Delaware, ends at a total depth of 1,337 ft in a mid-Oligocene glauconitic silt unit. It penetrated 317 ft of glauconitic sands and silts between the base of the Calvert Formation at a depth of 1,020 ft and total depth. A hiatus at 1,218 ft separates an outer neritic lower Miocene interval (Globorotalia kugleri Zone) above it from a deep upper bathyal mid-Oligocene (G. opima opima Zone) section below; the lower section is characterized by abundant large uvigerinid benthic foraminiferal species representing the transition from Uvigerina tumeyensis to Tiptonina nodifera. Similar uvigerinid assemblages identify the mid-Oligocene unit in boreholes near Bridgeville and Milford, Delaware; Cape May, New Jersey; and Ocean City, Maryland. Updip from these boreholes, the Calvert Formation, of latest Oligocene-middle Miocene age in Delaware, unconformably overlies middle Eocene glauconitic sands of the Piney Point Formation. The juxtaposition of the downdip mid-Oligocene rocks against the updip middle Eocene rocks can best be explained by a fault between the two regions. | en_US |
| URL | http://udspace.udel.edu/handle/19716/3167 | |
| Language | en_US | en_US |
| Publisher | Newark, DE: Delaware Geological Survey, University of Delaware | en_US |
| Part of Series | Report of Investigations | en_US |
| Part of Series | 48 | en_US |
| Keywords | Borehole Oh25-02 | en_US |
| Keywords | Lewes, Delaware | en_US |
| Keywords | Oligocene | en_US |
| Keywords | Pleistocene | en_US |
| Keywords | Miocene | en_US |
| Title | Geologic And Hydrologic Studies Of The Oligocene - Pleistocene Section Near Lewes, Delaware | en_US |
| Type | Technical Report | en_US |