Geologic Map of Offshore Delaware
| Author(s) | Mattheus, C.R. | |
| Author(s) | Ramsey, K.W. | |
| Author(s) | Tomlinson, J.L. | |
| Date Accessioned | 2020-03-25T15:10:40Z | |
| Date Available | 2020-03-25T15:10:40Z | |
| Publication Date | 2020-02 | |
| Abstract | Delineation of map units is based on sediment-core descriptions (e.g., texture, color, and composition) from 469 locations and seafloor morphology, which was assessed from a seamless NOAA/USGS topo-bathymetric model (Pendleton et al., 2014). The latter was integrated with high-resolution ‘chirper’ seismic reflection data, collected in 2013 by the Delaware Division of Natural Resources and Environmental Conservation (DNREC) and in 2015 as part of the 2015-2017 Bureau of Ocean Energy Management (BOEM) Atlantic Sand Assessment Project (ASAP), using sweep frequency pulses of 2-12 kHz and 0.7-12 kHz, respectively. Stratigraphic mapping based on these data allowed seafloor composition to be inferred across areas of limited core coverage (e.g., Federal waters, beyond 3 miles from shore) and facilitated the delineation of unit boundaries based on subsurface trends and seafloor geomorphology. A minimum surface-unit thickness of 1 ft served as the cut-off for geologic mapping of the seafloor, given the vertical resolution constraints of geophysical data. If surficial sediments were <1 ft thick, the underlying unit was mapped. Unit names and descriptions conform to those established in prior subsurface work along the Delaware barrier shoreline by Ramsey (1999), a synthesis of the Delaware coastal plain geology (Ramsey, 2010), and a previous map which included portions of the offshore surface geology (Ramsey and Tomlinson, 2012). | en_US |
| URL | http://udspace.udel.edu/handle/19716/25112 | |
| Language | en_US | en_US |
| Publisher | Newark, DE: Delaware Geological Survey, University of Delaware | en_US |
| Part of Series | Geologic map; | |
| Part of Series | ;25 | |
| Keywords | Cenozoic Era | en_US |
| Keywords | Quaternary Period | en_US |
| Keywords | Holocene | en_US |
| Keywords | upper Holocene | en_US |
| Keywords | lower Holocene | en_US |
| Keywords | Pleistocene | en_US |
| Keywords | upper Pleistocene | en_US |
| Keywords | middle Pleistocene | en_US |
| Keywords | lower Pleistocene | en_US |
| Keywords | Tertiary Period | en_US |
| Keywords | nearshore deposits | en_US |
| Keywords | finger shoal deposits | en_US |
| Keywords | sheet sand deposits | en_US |
| Keywords | Inter-Shoal deposits | en_US |
| Keywords | Ebb-Tide Delta Sand deposits | en_US |
| Keywords | lagoon deposits | en_US |
| Keywords | Ravinement Lag Deposits | en_US |
| Keywords | Sinepuxent Formation | en_US |
| Keywords | Marine Shelf Deposits | en_US |
| Keywords | Lynch Heights Formation | en_US |
| Keywords | Omar Formation | en_US |
| Keywords | Beaverdam Formation | en_US |
| Keywords | offshore | en_US |
| Keywords | sand resources | en_US |
| Keywords | Delaware | en_US |
| Keywords | Sussex County | en_US |
| Keywords | Rehoboth Beach | en_US |
| Keywords | Dewey Beach | en_US |
| Keywords | Cape Henlopen | en_US |
| Keywords | Bethany Beach | en_US |
| Keywords | Fenwick Island | en_US |
| Keywords | Lewes | en_US |
| Title | Geologic Map of Offshore Delaware | en_US |
| Type | Map | en_US |