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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1998-06 Excerpt: ...along the western edge of the aquifer. This type of hydrochemical facies would be equivalent to our variable composition hydrochemical facies, possibly with SO4-2 as the dominant anion. The differences between our results and those of Seaber (1965) are largely due to differences in the scale of the two studies and related differences in the areal definition of the aquifer (ours extends farther south than his). The aquifer is a nonfossiliferous, lignitic, fine to medium quartzose sand with some iron-cemented layers (Seaber, 1965, p. B11). Recharge takes place at a potentiometric high (Leahy and Martin, 1993, pl. 11C) just downdip from the outcrop, and some ground water flows toward and discharges in the outcrop. Oxidation-reduction reactions involving iron minerals take place in this area, which corresponds to Seaber's (1965, fig. 7) band of Ca+2 + Mg+2-SO4-2 + Cl hydrochemical facies. The recharge from the overlying Peedee-Severn aquifer (pl. 4B) is a calcium plus magnesium bicarbonate water. The water moves along aquifer flow paths in the direction of increasing TDS. It is converted to a sodium bicarbonate water by ion exchange processes. The processes in this aquifer are similar to the ones taking place in part (Region II) of the Magothy aquifer, Maryland, that were discussed in detail by Knobel and Phillips (1988). MAGOTHY AQUIFER IN MARYLAND, DELAWARE, AND NEW JERSEY In Maryland and Delaware, the Magothy aquifer is equivalent to the Magothy Formation; in New Jersey, it is equivalent to the Magothy Formation where it is recognized, or to the upper part of the undifferentiated Potomac Group and Raritan and Magothy Formations. The Late Cretaceous fluvial to marginal-marine deposits of the Magothy aquifer consist of well-stratified to crossbedded, ...

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