Browsing by Author "Talley, J.H."
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Item Basic Hydrologic Data For Coastal Sussex County, Delaware(Newark, DE: Delaware Geological Survey, University of Delaware, 1987-01) Talley, J.H.; Andres, A.S.Item Cretaceous And Tertiary Section, Deep Test Well, Greenwood, Delaware(Newark, DE: Delaware Geological Survey, University of Delaware, 1975-06) Talley, J.H.Analyses of drillers' and geophysical logs, cuttings, and 29 core samples from well Nc13-3 near Greenwood, Sussex County, Delaware indicate that the 1500-foot section penetrated by the drill can be divided into seven rock-stratigraphic units: Matawan Formation, Monmouth Formation, unit A, Piney Point Formation, Chesapeake Group (undifferentiated), Staytonville unit, and the Columbia Formation. The rock units are identified on the basis of texture, mineralogy, color, and interpretation of electric and gamma-ray logs. The oldest rocks penetrated are Upper Cretaceous; Tertiary and Quaternary rocks were also encountered. Correlations of the units encountered in the Greenwood test well with subsurface formations in adjacent parts of the Coastal Plain are explored utilizing lithologies, ages, positions in the stratigraphic column, and geophysical characteristics as criteria. Major time boundaries (Cretaceous-Tertiary; Early-Late Paleocene; Paleocene-Eocene; and Eocene-Miocene) are established by a preliminary study of mainly planktonic foraminifera. The Miocene-Pleistocene boundary was determined on changes in lithology across the unconformable contact.Item Domestic Water Systems(Newark, DE: Delaware Geological Survey, University of Delaware, 1998-02) Talley, J.H.Thousands of homeowners in Delaware currently rely on individual wells and water systems to provide water. In addition, hundreds of new wells and systems are constructed each year to provide water for those not served by public water systems.Item Domestic Water Well Construction(Newark, DE: Delaware Geological Survey, University of Delaware, 1998-02) Talley, J.H.The storage and movement of ground water depends on the types of rocks and associated interconnected spaces in which the water occurs. The Piedmont Province in northernmost Delaware is underlain by crystalline rocks. Because of the massiveness and hardness of such rocks, they yield little or no interstitial water to wells. Water is stored in and moves through fractures, cracks, and solution cavities. The amount of water available depends on the number and size of openings, and the degree to which they are interconnected. Wells drilled in the Piedmont range from 100 to 400 feet in depth and yields are highly variable over very short distances.Item Effects Of Earthquakes And Earth Tides On Water Levels In Selected Wells In The Piedmont Of Delaware(Newark, DE: Delaware Geological Survey, University of Delaware, 1980-02) Talley, J.H.Examination of continuous water-level hydrographs from two artesian observation wells in the Piedmont near Newark, Delaware reveals water-level fluctuations caused by earthquakes and by earth tides. The effects of 14 distant earthquakes with MS (surface wave) magnitudes between 6.7 and 8.0 and MB (body wave) magnitudes between 5.9 and 7.0 (National Earthquake Information Service, 1975-1977) have been recorded over a two-year and ten-month period.Item Geohydrology Of The Milford Area, Delaware(Newark, DE: Delaware Geological Survey, University of Delaware, 1982) Talley, J.H.Item Geohydrology of the Southern Coastal Area, Delaware(Newark, DE: Delaware Geological Survey, University of Delaware, 1987) Talley, J.H.Item Geologic And Hydrologic Aspects Of Landfills(Newark, DE: Delaware Geological Survey, University of Delaware, 1982-03) Spoljaric, N.; Talley, J.H.In the United States more than 3.5 billion tons of solid waste are generated annually. Of this, more than 2 billion tons are agricultural waste, such as manure and crop waste. Almost 300 million tons are generated by commercial and industrial activities and municipalities, and another 1.1 billion tons are attributed to various mining operations (Vaughan, 1969). Increasing amounts of solid waste have had detrimental effects on environmental quality. It has become necessary to reprocess and reuse some, and to provide safe and environmentally acceptable ways of disposing of the remaining waste in properly constructed landfills. Pollution brought about by improperly constructed landfills may be very severe. For example, the contaminants generated by the waste at the old, abandoned Army Creek Landfill, New Castle County, Delaware, were so widespread that the situation received national attention. General and sincere concern expressed by many citizens of our State has prompted the Delaware Geological Survey to prepare this report. The report explains the functioning of a landfill, problems improperly constructed landfills may cause, and the geologic and hydrologic aspects that have to be considered in selecting a suitable disposal site for solid waste. The report does not contain discussions of other important factors, such as social impact, transportation, and specific health hazards, that must also be considered.Item Geologic And Hydrologic Studies Of The Oligocene - Pleistocene Section Near Lewes, Delaware(Newark, DE: Delaware Geological Survey, University of Delaware, 1990-10) Andres, A.S.; Benson, R.N.; Ramsey, K.W.; Talley, J.H.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.Item Geologic Cross-Section of Delaware River, Red Lion Creek to Killcohook National Wildlife Refuge(Newark, DE: Delaware Geological Survey, University of Delaware, 1985) Talley, J.H.Test borings made in preparation for construction of a power line across the 2.3 miles wide Delaware River provided an opportunity to investigate the geology beneath the river which is otherwise inaccessible. The information is of value in studies of ground-water development near the River and for other engineered works as well as understanding the geologic history of a major feature of the State.Item Geologic Field Trips In Delaware(Newark, DE: Delaware Geological Survey, University of Delaware, 1977-05) Benson, R.N.; Hahn, W.F.; Jordan, R.R.; Pickett, T.E.; Talley, J.H.; Thompson, A.M.; Woodruff, K.D.The information contained in this Guidebook was compiled on the occasion of the Annual Meeting of the Association of American State Geologists held in Delaware in June 1977. The Delaware Geological Survey is pleased to have been selected to host this national meeting. The field trip logs were designed to familiarize geologists from across the United States with basic features of Delaware's geology and resources. We have also sought to identify some points of historical and cultural interest that may help the visitor become familiar with our State. Experience has shown that field guides retain their usefulness beyond the event that they initially served. They may assist classes, other groups, and individuals seeking additional information about their physical environment. Therefore, this Guidebook has been published as an Open File Report for public distribution. All users of this information are urged to exercise caution, especially at rock faces and along waterways, and to obtain specific permission for visits from landowners where necessary.Item Ground-Water Levels In Delaware January 1978 - December 1987(Newark, DE: Delaware Geological Survey, University of Delaware, 1988-10) Talley, J.H.Water-level records from 19 observation wells in Delaware for the period January 1978 - December 1987 provide the bases for analyses of water-level fluctuations. Water levels in shallow water-table wells generally rise from November to March when recharge exceeds discharge and decline during the warm growing season from May through September. Although water levels in individual water-table wells fluctuated by as much as 11.72 feet during the 10-year period studied, the water-table system remained in a state of dynamic equilibrium and exhibited no significant changes in aquifer storage.Item Ground-Water Levels In Delaware July, 1966 - December, 1977(Newark, DE: Delaware Geological Survey, University of Delaware, 1978-12) Talley, J.H.Water-level records from 13 observation wells in Delaware for the period July, 1966 - December, 1977 provide the bases for the analyses of water-level fluctuations. Water levels in shallow water-table wells generally rise from November to March, when recharge exceeds discharge, and decline during the warm growing season from May through September. Although water-levels in individual wells changed by as much as 11.17 feet during the 11.5 year period studied, the water-table system remained in a state of dynamic equilibrium and exhibited no permanent changes in aquifer storage. However, the water levels in three artesian observation wells have declined during the same 11.5 year period in response to high demands for ground water while levels in the other two artesian wells have risen slightly due to a reduction in ground-water discharge, or increase in ground-water recharge, or both. Nevertheless during the past several decades, water levels have declined, cones of depression have enlarged, and reductions in aquifer storage, have occurred in the Potomac aquifer in central and southeastern New Castle County, and the Piney Point and Cheswold aquifers in the Dover-Dover Air Force Base area. Therefore, future groundwater development in the artesian aquifers must be carefully planned and managed.Item Guidebook: Columbia Deposits Of Delaware(Newark, DE: Delaware Geological Survey, University of Delaware, 1976-05) Jordan, R.R.; Talley, J.H.The Columbia sediments of Delaware cover almost all of the surface of the Coastal Plain portion of the State. A major unconformity separates these predominantly sandy materials from the underlying rocks of the Coastal Plain. As it includes the materials closest to the surface in most places, the Columbia has great practical importance in Delaware. In addition to the morphology and soils which are largely dictated by the Columbia, it holds about 90 percent of the State's groundwater supplies, is the geologic foundation for most construction, and yields essentially all of the sand and gravel mined here.Item Hydrogeology Of Selected Sites In The Greater Newark Area, Delaware(Newark, DE: Delaware Geological Survey, University of Delaware, 1974-09) Talley, J.H.Additional sources of ground water have been located in the Piedmont Province as a result of a ground-water exploration program conducted by the Delaware Geological Survey at the University of Delaware in cooperation with the City of Newark. Drilling sites for relatively high-yielding wells were located through the use of geophysical investigations, air-photo interpretation, field mapping, and review of existing data.Item Instructions For Preparation Of Delaware Geological Survey Data Base Schedules(Newark, DE: Delaware Geological Survey, University of Delaware, 1984-01) Talley, J.H.; Windish, D.C.; Ramsey, K.W.This report contains the new DGS data schedules, describes the information that should be recorded on each schedule, and presents instructions for preparation of the schedules. The schedules are designed to make various kinds of data consistent with the input format screens utilized in the automated system.Item Sinkholes, Hockessin Area, Delaware(Newark, DE: Delaware Geological Survey, University of Delaware, 1981-03) Talley, J.H.Sinkholes are depressions in the land surface or holes in the ground caused by subsidence or collapse of surficial material into openings in soluble rock. Sinkholes usually develop in "karst" areas underlain by carbonate rocks. Karst is defined as "terrane with distinctive characteristics of relief and drainage arising primarily from a higher degree of rock solubility in natural waters than is found elsewhere" (Jennings, 1971, p.1). In addition to sinkholes, other features associated with karst are: caves, disappearing streams, and well-developed subsurface drainage systems.Item Sources Of Ground-Water Contamination In Delaware(Newark, DE: Delaware Geological Survey, University of Delaware, 1985-06) Talley, J.H.Ground water is Delaware's most important natural resource. Our aquifers, which are present everywhere in Delaware, provide more than 75 million gallons each day for all uses. Nearly all of the water used in Delaware south of the Chesapeake and Delaware Canal is obtained from aquifers, both water-table and artesian. An appreciable quantity of water is also obtained from aquifers in northern New Castle County. Ground water has generally been of good quality, been used with little or no treatment, and has been readily available at low cost.Item The Storm Of July 5, 1989: Hydrologic Conditions(Newark, DE: Delaware Geological Survey, University of Delaware, 1989-10) Talley, J.H.Heavy precipitation associated with intense thunderstorm activity occurred in northern New Castle County, Delaware, from 0500 to 1300 hours on July 5, 1989. The most intense rainfall, which fell between 0600 and 1100 hours, is classified as a 100 year event in New Castle County. Record high stream discharges occurred at five gaged sites and three miscellaneous sites. One hundred-year floods were recorded at four sites.Item Summary Report The Coastal Storm Of December 10-14, 1992 Delaware And Maryland(Newark, DE: Delaware Geological Survey, University of Delaware, 1993-02) Ramsey, K.W.; Talley, J.H.; Wells, D.V.On December 10, a low pressure system moved rapidly north-northwest from eastern North Carolina and Virginia, up the Chesapeake Bay to a position just west of Chestertown in Kent County, Maryland by 0700 on December 11. The system then moved irregularly to the southeast, stalled for several hours over Georgetown, Delaware, and proceeded offshore early on December 12. Approximate locations of the storm's track are shown on Figure 1. The storm had associated rain that contributed to some local stream flooding and high winds that created strong surf and waves. The waves were compounded by an astronomical high tide (full moon) to produce coastal flooding along Delaware Bay and some breaching of the dunes along the Atlantic coast. The position of the storm offshore blew north-northeast winds onto the coast and abnormally high tides continued through December 15.