The section from the early Eocene (Zone NP 12) through the early Oligocene (Zone NP 21) is nearly complete at this locality; in fact, it is one of the most complete sections through this part of the geologic column found anywhere to date in the U.S. Atlantic Coastal Plain. The presence of upper Eocene and lower Oligoeene sediments in the New Jersey Coastal Plain was heretofore unknown. Thus, informal names are:used for some units. All the Paleogene formations recovered in the core were deposited in a shelf environment and are cyclic in character. Each reflects deeper 'water deposition in its lower part and contains shallower water sediments in its upper part. All the formations are separated by unconformities. The Kirkwood Formation, which overlies the ACGS Beta unit unconformably, is the thickest unit in the hole. This unit ranges in age from early Miocene (early Burdigalian) to perhaps early middle Miocene (Langhian). The late Miocene (Tortonian.) age proposed for-the Kirkwood imthe southern New Jersey Coastal Plain by some was not substantiated in this hole or in the array of holes surrounding it. Diatoms obtained irom the upper Kirkwood indicate that this part of the unit is correlative with the lower Calvert Formation of the Chesapeake Group in Virginia,: Delaware, and Maryland. The lower part of the Kirkwood is older than any unit known from the Chesapeake Group to the south; suggesting that what is now New Jersey was the earliest'area of downwarping in the northern U.S. Atlantic Coastal Plain during Mioeene time. The Kirkwood is largely a marine deltaic unit consisting of interbedded shallow shelf and prodelta deposits.

This report presents selected data on wells, exploratory boreholes, and ground-water quality in Atlantic County and parts of eastern Ocean and Cape May Counties, New Jersey. It is one of a series of reports based on the results of a study of ground-water supplies in Atlantic City and vicinity, funded by the New Jersey Water-Supply Bond of 1981. Construction details are presented for 807 wells and exploratory boreholes, and results of more than 3,500 chemical analyses of water samples collected from 313 wells from 1924-88 are given. During the current study, water samples from -166 wells were analyzed for common ions, phenols, selected trace elements, nutrients, and volatile organic compounds; water from six of these wells also was analyzed for pesticides. An index of geophysical logs, including caliper, gamma-gamma, fluid-conductivity, gamma-ray, 6-foot-lateral-resistivity, neutron, single-point-resistance, sonic, short-and long-normal-resistivity, spontaneous-potential, and fluid-temperature, made in 75 wells and exploratory boreholes also is included.Atlantic City and vicinity conducted during 1983-88 and funded by the New Jersey Water-Supply Bond of 1981. (Hereafter, this investigation is called the recent Atlantic City study.) Additional information on the objectives, approach, and planned products of this investigation is given in Leahy and others (1987). Description of Study AreaAtlantic County, an area of about 565 mi 2 (square miles), is in the southeastern part of New Jersey (fig. 1). Atlantic County and vicinity, as used in this report, occupies about 1,200 mi 2 and includes all of Atlantic County and parts of adjoining Ocean, Burlington, Cumberland, and Cape May Counties (fig. 1). The study area is bounded on the east by the Atlantic Ocean.According to the Federal Census of 1980 (U.S. Department of Commerce, 1982), the resident population of Atlantic County was 194,119, or about 350 persons per mi 2 . Most of the population is concentrated in the eastern part of the county. Atlantic City, with 40,199 inhabitants, has the largest population of any urban area in the county. The population of Atlantic County is projected to reach 252,800 by the year 2000 (New Jersey Office of Demographic and Economic Analysis, 1983, p. 15). The population of the study area increases greatly during the summer because of the influx of tourists to the coastal resorts.In 1981, wooded acreage accounted for about 61 percent of the total area of Atlantic County; wetlands, 14 percent; residential areas, 10 percent; and farmland, 9 percent. In order of decreasing percentage of the remaining 6 percent, the rest of the area was used for commercial, recreational, public, and industrial purposes (J. Brennan, Atlantic County Department of Regional Planning and Development, oral commun., 1986). About 70 percent of Atlantic County lies within the New Jersey Pinelands protected area (A. D'Arcy, New Jersey Pinelands Commission, oral commun., 1986) . Previous InvestigationsThis report presents hydrologic data collected as part of several...

Selected data on the ground-water resources of Philadelphia, Pennsylvania, are presented in this report. Information including water levels and data on aquifers is tabulated for 828 wells and 3 sumps. Chemical analyses are given for 1,467 water samples obtained from 205 sites and include 103 analyses for trace elements and 68 analyses for volatile organic compounds. An index of geophysical logs including gamma ray, neutron, caliper, fluid conductivity, fluid velocity, single-point resistance, spontaneous potential, and temperature determinations made-in 51 wells is also presented. Data-collection sites are shown on a 1:50,000 scale location map. DESCRIPTION OF AREAThe city of Philadelphia has an area of 134.6 square miles in the Piedmont and Coastal Plain physiographic provinces of southeastern Pennsylvania (fig. 1). The Piedmont lies in a broad area northwest of the Fall Line, whereas the Coastal Plain occupies a narrow band along the Delaware River. The Fall Line demarcates the landward edge of the Coastal Plain. CalendarWSP Calendar WSP Calendar WSP Year No. Year No. Year No.

Ground water is an important natural resource in Delaware that supplies 67 percent of the population (about 400,000 people) with drinking water. In 1985, 79 million gallons of ground water were withdrawn daily in the State. Of that quantity, 37 percent was used for public supply, 26 percent was for agriculture, 20 percent was used by industry, 16 percent was for domestic and commercial use, and 1 percent was for thermoelectric-power generation. The major issues related to ground water in Delaware are: Contamination by agricultural chemicals and hazardous wastes, Effects of land use, and Declining water levels and intrusion of brackish water.

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