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Scientific Investigations Map 3055

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Prepared in cooperation with the City of Jacksonville, Onslow Water and Sewer Authority, and U.S. Marine Corps, Camp Lejeune

Hydrogeologic Framework of Onslow County, North Carolina, 2008

By Jason M. Fine

Thumbnail of and link to report PDF (7.77MB)Abstract

The unconsolidated sediments that underlie the Onslow County area are composed of interlayered permeable and impermeable beds, which overlie the crystalline basement rocks. The aquifers, composed mostly of sand and limestone, are separated by confining units composed mostly of clay and silt. The aquifers from top to bottom are the surficial, Castle Hayne, Beaufort, Peedee, Black Creek, and Upper and Lower Cape Fear aquifers. For this study, the Castle Hayne aquifer is informally divided into the upper and lower Castle Hayne aquifers.

The eight aquifers and seven confining units of the Tertiary and Cretaceous strata beneath Onslow County are presented in seven hydrogeologic sections. The hydrogeologic framework was refined from existing interpretations by using geophysical logs, driller’s logs, and other available data from 123 wells and boreholes.

First posted April 28, 2009

Revised December 17, 2013

For additional information, contact:
Director, North Carolina Water Science Center
U.S. Geological Survey
3916 Sunset Ridge Rd
Raleigh, N.C. 27607
http://nc.water.usgs.gov/

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Suggested citation:

Fine, J.M., 2008, Hydrogeologic framework of Onslow County, North Carolina, 2008: U.S. Geological Survey Scientific Investigations Map 3055, 1 sheet. (available online at https://pubs.usgs.gov/sim/3055/).


Contents

Abstract

Introduction

Study Area

Methods

Surficial Aquifer

Upper and Lower Castle Hayne Aquifers

Beaufort Aquifer

Peedee Aquifer

Black Creek Aquifer

Upper and Lower Cape Fear Aquifers

Summary

References


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