Upper Cenozoic deposits of the central Delmarva Peninsula, Maryland and Delaware

Owens, James Patrick; Denny, Charles Storrow

doi:10.3133/pp1067a

Cited by 57 publications

(68 citation statements)

References 6 publications

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“…20 and 21). These sediments are overlain by Quaternary deposits that are fluvial, marine, and eolian in origin (Owens and Denny, 1979). The bottom surface of the Quaternary deposits varies in elevation from over 60 ft above NGVD 29 in the northern peninsula to more than 100 ft below NGVD 29 near the east-west border between Maryland and southern Delaware ( fig.…”

Section: Geologic Characteristicsmentioning

confidence: 99%

Simulation of groundwater flow in the shallow aquifer system of the Delmarva Peninsula, Maryland and Delaware

Sanford¹,

Pope²,

Selnick³

et al. 2012

Open-File Report

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For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprodTo order this and other USGS information products, visit http://store.usgs.gov Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. AbstractEstimating future loadings of nitrogen to the Chesapeake Bay requires knowledge about the groundwater flow system and the traveltime of water and chemicals between recharge at the water table and the discharge to streams and directly to the bay. The Delmarva Peninsula has a relatively large proportion of its land devoted to agriculture and a large associated nitrogen load in groundwater that has the potential to enter the bay in discharging groundwater. To better understand the shallow aquifer system with respect to this loading and the traveltime to the bay, the U.S. Geological Survey constructed a steadystate groundwater flow model for the region. The model is based on estimates of recharge calculated using recently developed regression equations for evapotranspiration and surface runoff. The hydrogeologic framework incorporated into the model includes unconfined surficial aquifer sediments, as well as subcropping confined aquifers and confining beds down to 300 feet below land surface. The model was calibrated using 48 water-level measurements and 24 tracer-based ages from wells located across the peninsula. The resulting steady-state flow solution was used to estimate ages of water in the shallow aquifer system through the peninsula and the distribution and magnitude of groundwater traveltime from recharge at the water table to discharge in surface-water bodies (referred to as return time). Return times vary but are typically less than 10 years near local streams and greater than 100 years near the stream divides. The model can be used to calculate nitrate transport parameters in various local watersheds and predict future trends in nitrate loadings to Chesapeake Bay for different future nitrogen application scenarios.

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Section: Geologic Characteristicsmentioning

confidence: 99%

Simulation of groundwater flow in the shallow aquifer system of the Delmarva Peninsula, Maryland and Delaware

Sanford¹,

Pope²,

Selnick³

et al. 2012

Open-File Report

View full text Add to dashboard Cite

show abstract

“…Consequently, many of the 20th century geologic interpretations of these silty strata have associated their origin with Quaternary fluvial terraces and/or estuarine sediments deposited during periods of high sea level (e.g., Shattuck, 1906;Miller, 1926;Rasmussen and Slaughter, 1957). Subsequent interpretations, built on these ideas, suggest that the silts were additionally entrained and redeposited by eolian processes during sea level lowstands (e. g., Carey et al, 1976;Owens and Denny, 1979). More recent soil and sedimentological analyses indicate a broader regional expanse of these sediments and support a purely wind blown origin with parent material derived from glacial outwash from the Susquehanna River during and after the Last Glacial Maximum (Reybold, 1970;Foss et al, 1978;Lowery, 2002;Wah, 2003;NRCS, 2009).…”

Section: Introductionmentioning

confidence: 99%

Late Pleistocene upland stratigraphy of the western Delmarva Peninsula, USA

Lowery

O’Neal

Wah³

et al. 2010

Quaternary Science Reviews

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“…In three of the samples, pine or birch are dominant, and in one section, S30271, oak is the most abundant pollen, along with birch and forest taxa of warm-temperate environments. In the Atlantic Coastal Plain, temperate environments and relatively high stands of the sea occurred during the Sangamon and the early and middle Wisconsinan (Owens and Denny, 1979;Sirkin, 1977;and Sirkin and Stuckenrath, 1980). Thus, the Pleistocene assemblages described in this study could represent episodes and environments of deposition other than those traditionally associated with the Gardiners Clay.…”

Section: Well 821091 On Fire Islandmentioning

confidence: 62%

Palynology and stratigraphy of Cretaceous and Pleistocene sediments on Long Island, New York; a basis for correlation with New Jersey coastal plain sediments

Sirkin¹

1986

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Upper Cenozoic deposits of the central Delmarva Peninsula, Maryland and Delaware

Cited by 57 publications

References 6 publications

Simulation of groundwater flow in the shallow aquifer system of the Delmarva Peninsula, Maryland and Delaware

Simulation of groundwater flow in the shallow aquifer system of the Delmarva Peninsula, Maryland and Delaware

Late Pleistocene upland stratigraphy of the western Delmarva Peninsula, USA

Palynology and stratigraphy of Cretaceous and Pleistocene sediments on Long Island, New York; a basis for correlation with New Jersey coastal plain sediments

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