Skip to main content
USGS - science for a changing world
Advanced Search

Filters: Tags: Precambrian (X)

18 results (94ms)   

View Results as: JSON ATOM CSV
thumbnail
In 1968, the Missouri Geological Survey (MGS) established the Operation Basement program to address three objectives: a) to obtain drill hole and underground mining data relative to the structure and composition of the buried Precambrian basement; b) to expand mapping in the Precambrian outcrop area and conduct research related to Precambrian geology and mineral resources; and c) to publish the results of the first two objectives in the Contribution to Precambrian Geology series (Kisvarsanyi, 1976). The database presented here represents the first of those objectives. It was originally compiled in close cooperation with exploration and mining companies operating in Missouri, who provided drillhole data, core and...
Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Adair County, Andrew County, Atchison County, Audrain County, Barry County, All tags...
This set includes 52 cores collected from the Mohawk River Valley, NY (Herkimer, Fulton, Montgomery, Schoharie, and Saratoga Counties). Each well was cored continuously from the top of bedrock to the total depth (TD), capturing a complete stratigraphic section of Late Ordovician to (in most cases) Precambrian basement. Core diameters are BX and NX, and lengths range from ~400 to ~1400 feet. The Mohawk Valley cores are of particular value because they were collected at the north end of the Appalachian Basin, in an area where there has been little other exploratory drilling. The results from previous analyses are available upon request.
thumbnail
This cover contains structure contours of the elevations of theunconformity at theCambrian-Precambrian boundary. These data were contributed byGlenn Bear of Indiana University as part of the work onhis doctoral thesis. The southern part of the map was produced byJames Drahovzal of the Kentucky Geological Survey and merged withBear's map of the rest of the map area and beyond. Public andproprietary seismic reflection and well data were used to define thestructure. Units are in thousands of feet below sea level.A prominent east-west structure in the southern half of the maparea is the western end of the Rough Creek Graben. At its deepestpoint the unconformity is more than 30,000 ft(9,100 m) below sea level. Faulted...
Tags: 1100 - Geology, 1102 - Structure Contours, 17025 = Clay, 17047 = Edwards, 17055 = Franklin, All tags...
thumbnail
This cover contains structure contours of the elevations of theunconformity at the Cambrian-Precambrian boundary.These data were contributed byGlenn Bear of Indiana University as part of the work onhis doctoral thesis. The southern part of the map was produced byJames Drahovzal of the Kentucky Geological Survey and merged withBear's map of the rest of the map area and beyond. Use of public andproprietary seismicreflection and well data were used to define thestructure. Units are in thousands of feet below sea level.A prominent east-west structure in the southern half of the maparea is the western end of the Rough Creek Graben. At its deepestpoint the unconformity is more than 30,000 ft(9,100 m) below sea level....
Tags: 1100 - Geology, 1102 - Structure Contours, 17025 = Clay, 17047 = Edwards, 17055 = Franklin, All tags...


    map background search result map search result map Seismotectonic maps in the vicinity of the lower Wabash Valley,Illinois, Indiana, and Kentucky - Digital Spatial Database:Structure contours on Cambrian-Precambrian unconformity Seismotectonic maps in the vicinity of the lower Wabash Valley,Illinois, Indiana, and Kentucky - Digital Spatial Database:Structure contours on Cambrian-Precambrian unconformity Operation Basement: Missouri Precambrian Sample Database Mohawk Valley Cores Mohawk Valley Cores Seismotectonic maps in the vicinity of the lower Wabash Valley,Illinois, Indiana, and Kentucky - Digital Spatial Database:Structure contours on Cambrian-Precambrian unconformity Seismotectonic maps in the vicinity of the lower Wabash Valley,Illinois, Indiana, and Kentucky - Digital Spatial Database:Structure contours on Cambrian-Precambrian unconformity Operation Basement: Missouri Precambrian Sample Database