DGS Annual Report

DGS Annual Report of Programs and Activities.

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GM15 Geologic Map of the Georgetown Quadrangle, Delaware

GM15 Geologic Map of the Georgetown Quadrangle, Delaware

The geologic history of the surficial geologic units of the Georgetown Quadrangle is primarily that of deposition of the Beaverdam Formation and its subsequent modification by erosion and deposition of younger stratigraphic units. The age of the Beaverdam Formation is uncertain due to the lack of age-definitive fossils within the unit. Stratigraphic relationships in Delaware indicate that it is no older than late Miocene and no younger than early Pleistocene. Regional correlations based on similarities of depositional style, stratigraphic position, and sediment textures suggest that it is likely late Pliocene in age; correlative with the Bacons Castle Formation of Virginia (Ramsey, 1992, 2010).

National LiDAR applications and benefits: a perspective from the states

William S. Schenck, of the Delaware Geological Survey, gave a presentation at the Association of American Geographers annual meeting, Washington, D.C., April 14. The paper was titled "National LiDAR Applications and Benefits: A Perspective from the States."

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A GIS screening tool for assessing suitability of land for RIBS

Scott Andres and Edward Walther, of the Delaware Geological Survey, presented "Development and Application of a GIS Screening Tool for Assessing Suitability of Land for Rapid Infiltration Basin Systems" at the National Ground Water Association Summit, Denver, April 12-15. Andres also participated in a panel discussion co-sponsored by the U.S. Subcommittee on Groundwater, "National Groundwater Monitoring Network: Listening Session."

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DGS Cooperative and Joint-Funded Programs

The DGS is, by statute, the state agency responsible for entering into agreements with its counterpart federal agencies, including the U.S. Geological Survey, the USGS Office of Minerals Information (formerly the U.S. Bureau of Mines), and the Bureau of Ocean Energy Management, Regulation and Enforcement (formerly the U. S. Minerals Management Service), and for administering all cooperative programs of the State with these agencies. The DGS also works with many in-state and out-of-state partner agencies and organizations.

DataMIL receives USGS John Wesley Powell Award

DataMIL team receives the award from USGS Director Chip Groat
Date: Sep 2004

A team of state and University of Delaware staff has been awarded the 2003 John Wesley Powell award "for noteworthy contributions to the mission and objectives of the U. S. Geological Survey." The group was honored for developing the Delaware Data Mapping and Integration Laboratory (DataMIL).

The Delaware DataMIL Gets a New Look!

The DataMIL gets a New Look!
Date: Mar 2009

The Delaware DataMIL was redesigned to take advantage of more modern web technologies as well as to answer key feature requests to the system. In particular, new additions to the DataMIL include: complete FGDC metadata for all layers, a map previewer embedded into the metadata catalog, and the ability for all datasets (vector and raster) to downloaded as raw GIS data files as well as ArcIMS and WMS map services

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Water Conditions Summary Station Map

Map displaying all observing stations monitored by DGS for current and long-term conditions as part of the Water Conditions Summary for Delaware.

Outer Continental Shelf Core and Sample Repository

Project Contact(s):

The Delaware Geological Survey's Outer Continental Shelf (OCS) Core and Sample Repository is a large collection of cores and samples from oil and gas wells drilled offshore the Atlantic Coast of the U.S. during the 1970s and 1980s. This collection was assembled from the contributions of federal agencies, other state agencies, and private institutions that have recognized the value of having a centralized repository for this material.

First 1:24,000 scale Geologic Map Published

First 1:24,000 scale Geologic Map Published
Date: Jul 1970

Geologic Map Series No. 1
Geology of the Chesapeake and Delaware Canal Area, Delaware
By Thomas E. Pickett

First 1:24,000 scale Hydrologic Map Published

First 1:24,000 scale Hydrologic Map Published
Date: Apr 1972

Geohydrology of the Dover Area, Delaware
Hydrologic Map Series No. 1
By Ken D. Woodruff

IS6 Delaware's State Boundaries

Delaware's State Boundaries

One hundred seventy-nine monuments help to mark Delaware's boundaries with Maryland, Pennsylvania, and New Jersey. Although there are only four major boundaries, there are seven boundary lines that make up the confines of the State. They are the east-west boundary, or Transpeninsular Line; the north-south boundary, or the Tangent Line, Arc, and North lines;; the Delaware-Pennsylvania boundary, including the Top of the Wedge Line and the 12-mile Circle; and the Delaware-New Jersey boundary including the 1934 Mean Low Water Line and the Delaware Bay Line. Only the Transpeninsular, Tangent, Arc, North, 12-mile Circle, and 1934 Mean Low Water lines are monumented. The Delaware Bay Line is defined by the navigational
channel. The boundaries described here evolved through long, complex histories (see references). They are based largely on adjudication in England of conflicting claims by the Penns and the Calverts for the Pennsylvania and Maryland colonies.

DGS Digital Datasets

In the same ways as our printed publications, digital data released by the DGS represent the results of original professional research and as such are used by professionals and the public.

Interactive Map of Delaware Earthquakes

Map and data listing of all earthquakes with an epicenter within the State of Delaware.

RI53 Geology of the Seaford Area, Delaware

RI53 Geology of the Seaford Area, Delaware

This report supplements the map "Geology of the Seaford Area, Delaware" (Andres and Ramsey, 1995). The map portrays surficial and shallow subsurface stratigraphy and geology in and around the Seaford East and Delaware portion of the Seaford West quadrangles. The Quaternary Nanticoke deposits and Pliocene Beaverdam Formation are the primary lithostratigraphic units covering upland surfaces in the map area. Recent swamp, alluvial, and marsh deposits cover most of the floodplains of modern streams and creeks. The Miocene Choptank, St. Marys, and Manokin formations occur in the shallow subsurface within 300 ft of land surface. The Choptank, St. Marys, and Manokin formations were deposited in progressively shallower water marine environments. The Beaverdam Formation records incision of underlying units and progradation of a fluvial-deltaic system into the map area. The geologic history of the Quaternary is marked by weathering and erosion of the surface of the Beaverdam and deposition of the Nanticoke deposits by the ancestral Nanticoke River. Depositional environments in the Nanticoke deposits include fresh water streams and ponds, estuarine streams and lagoons, and subaerial dunes.

SP4 Generalized Geologic Map of Delaware

SP4 Generalized Geologic Map of Delaware

The Generalized Geologic Map of Delaware is a brief summary for general use indicating the major types and locations of rocks present throughout the State, and their interrelationships. The map is preliminary as it is a first step in a continuing program of detailed geologic mapping. It is based upon many existing sources of data; additional detail may be found in the references listed.

OFR17 A Guide to Information on Benchmarks in Delaware

OFR17 A Guide to Information on Benchmarks in Delaware

To conduct an elevation survey, a surveyor needs a starting point for which the exact elevation above mean sea level is known. These starting points are called benchmarks. State and federal agencies install benchmarks throughout every State, creating a network of elevation points which covers the entire continental United States. These benchmarks are considered to be permanent, and usually consist of a brass, bronze, or aluminum disc about 4 inches in diameter mounted in a cement post or in a drill hole in a permanent foundation. Each benchmark also has the installing agency's name and an identification number stamped into it. In December of 1980 the Federal Emergency Management Agency (FEMA) allotted the State of Delaware funds to determine the number and condition of federal benchmarks and other elevation reference control points. The National Flood Insurance Program (NFIP), contained within FEMA, requires accurate flood surveys of property in flood-prone areas. An extensive and accurate benchmark network throughout the State is needed to help meet these needs.

OFR39 Basic Data for the Geologic Map of the Seaford Area, Delaware

OFR39 Basic Data for the Geologic Map of the Seaford Area, Delaware

The Seaford area geologic mapping project (Andres and Ramsey, 1995) was conducted by Delaware Geological Survey (DGS) staff and focused on the Seaford East (SEE) and Delaware portion of the Seaford West (SEW) quadrangles (Fig. 1). Data evaluated in support of mapping from these quadrangles and surrounding areas are documented in this report.

SP16 Generalized Geologic Map of Delaware, Postcard

SP16 Generalized Geologic Map of Delaware, Postcard

Delaware’s oldest rocks are metamorphic crystalline rocks of the central Appalachian Piedmont Physiographic Province. Atlantic Coastal Plain sediments overlie the crystalline rocks of the Piedmont and range in thickness from a feather edge at the Fall Line to approximately 9,000 feet in the southeastern corner of Delaware. Sediments range in age from Early Cretaceous to Holocene.

SP17 The Delaware Geological Survey: The Formative Years, 1951-1969

SP17 The Delaware Geological Survey: The Formative Years, 1951-1969

Emphasis is placed herein on the years of Dr. Groot's leadership of the Survey. The remarkable work of James C. Booth in the last century is acknowledged but has elsewhere been entered in history. Some continuing activities of the Survey after 1969 are noted together with comments of an experienced observer; this current period may someday receive the attention of a recorder having the enhanced perspective of time.