
North Carolina Geological Survey
Repository of core, cuttings, and 
geophysical logs.
==================================

This is an explanatory file for fields in the NC Geological Survey's Repository of Core, cuttings, and Geophysical Logs database. The accompanying data file will be in *.dbf format which most spreadsheet and database software programs can read. 

Database File created by John Nickerson and Bill Hoffman, from physical  materials on file at the Raleigh Field Office, NC Geological Survey, 1620 Mail Service Center, Raleigh, NC, 27699-1620, 919-733-7353. Fax: 919-715-3181. 

e-mail:  john.nickerson@ncmail.net

Original format: IBM's pfs:file database software (1985); exported to Borland's dbase IV (*.dbf) (1987); exported to Claris' FileMaker Pro 2.1 (Macintosh platform) (1991); exported to Microsoft Excel (*.xls) (1995); exported to ESRI ArcView 3.0 (PC) (1996) in shapefile format, software upgraded to Version 3.2 in 1999; currently using ESRI ArcGIS 8.3 platform. Decidegrees of latitude and longitude are provided in the database for plotting in a GIS.

*****Note: This file is not rigorously maintained and may contain errors. Please report discrepancies to:

John Nickerson
john.nickerson@ncmail.net
1612 Mail Service Center
Raleigh, NC  27699-1612
919-733-2424 ext. 407
 *****


May 08, 2002

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Data field explanations
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NCGS Code: alphanumeric code for the hole of interest, format is 2-letter county abbreviation, type of hole 
(T=test; C=core; A=auger; P=producing (outdated water-well designation); and OT=oil & gas exploratory hole), sequence number within a given year, and year drilled.

PP 796:  USGS Professional Paper 796 cross-reference number for the well.

Well Name:  usually lease-name for oil & gas exploration wells

Other Code:  company code, or other tracking code used to id the well.

Latitude:  degrees, min, sec

Longitude:  degrees, min, sec

Well datum:  elevation of measuring point for logging, usually ground surface, but in the case of oiltests, is usually the KB (kelly bushing).

County:  self-explanatory

Operator:  owner of well

Depth:  total depth of well

Drilled by:  actual driller, not owner of hole

Date Drilled:  full year, month, day

Logged by:  geophysical logging contractor

Date logged:  self-explanatory

Logs:  listing of geophysical logs run on the borehole, "standard" abbreviations used, call me if you need a list.

Samples:  samples archived by NCGS, boolean field, true or false

Slides:  paleontologic slides available, boolean field, true or false

Lith log:  good quality lithologic log for the hole, boolean field, true or false

Cuttings:  cuttings available, boolean field, true or false

Ctgs Interval:  cuttings intervals archived

Core:  core available, boolean field, true or false

Core Interval:  core intervals archived

SWC:  side wall cores (oiltests), boolean field, true or false

SWC Interval:  side wall core intervals

Interval:  continuation of side wall core intervals

Tops:  formation tops picked, boolean field, true or false

Basement:  bedrock reached, boolean field, true or false

Bsmt Lith:  bedrock lithology

GW Grid:  NC Ground Water Section grid coordinates for borehole (a filled field indicates a well that the Groundwater Section drilled or logged).

Ctgs Footage:  total cuttings footage for hole.

Core Footage:  total core footage for hole.

Bsmt depth:  log depth of bedrock surface

Bsmt altitude:  depth of bedrock, reference MSL

Type:  type of hole, Welldata=municipal, industrial, and domestic water wells;  Hardrock=mineral exploration tests, in piedmont/blue ridge;  
	Triassic=triassic basin holes;  Oiltest=oil and gas exploratory holes.

Deci-long:  decidegrees of longitude

Deci-lat:  decidegrees of latitude