Dethier_Lazarus_2006_COwelldata_csv.csv (255.6 kB)

Data for 'Geomorphic inferences from regolith thickness, chemical denudation and CRN erosion rates near the glacial limit, Boulder Creek catchment and vicinity, Colorado'

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posted on 31.10.2018, 11:21 by David Dethier, Eli Lazarus
These data accompany the analysis of regolith weathering across ~940 km2 of the Front Range (Colorado, USA) described by Dethier & Lazarus (2006).

We collected data from 1872 paper records of well-drillers' logs held on file at the Colorado Department of Water Resources (Denver office). We used every interpretable record from the Allens Park, Eldorado Springs, Gold Hill, Nederland, Tungsten, and Ward quadrangles. We recorded the thickness of overburden, alluvium, and highly weathered regolith, along with the total weathered thickness, depth to fresh bedrock, total well depth, and any drillers’ notes. We then digitized well locations (and their associated data) on topographic quadrangles in ESRI ArcMap. The maximum probable location error for any well in the dataset is the area of a 1/16 section (approximately 0.16 km2). See Dethier & Lazarus (2016) a detailed description of the methods.

This data file includes the following attributes:

OBJECT_ID & NEW_ID (identification index)
WELL_NUMBE (well number assigned by the Colorado Department of Water Resources)
POINT_X (UTM Northing – NAD 1983 UTM Zone 13N)
POINT_Y (UTM Easting – NAD 1983 UTM Zone 13N)
QUADRANGLE (Colorado state 7.5' quadrangle)
TOWNSHIP (township notation in quadrangle)
RANGE (range notation in quadrangle)
SECTION (section number in quadrangle)
QUARTER (quarter location within QUARTER_1)
QUARTER_1 (quarter location within section)
OVERBURDEN & OVRBRDN_M (overburden thickness, in ft & m)
ALLUVIAL_ & ALLUVIAL_M (alluvial thickness, in ft & m)
HIGHLY & HIGHLY_M (highly weathered thickness, in ft & m)
TOTAL & TOTAL_M (total weathered thickness, in ft & m)
DEPTH & DEPTH_M (depth to bedrock, in ft & m)
MINIMUM & MINMM_M (minimum drilled well depth, in ft & m)
DIST_FLTS (using geologic map of Colorado by Green (1992), distance to nearest fault or dike, in m)
DIST_STREAMS (using geologic map of Colorado by Green (1992), distance to nearest third-order stream (or larger), in m)
ROCK_TYPE (code corresponds to geologic unit in geologic map of Colorado by Green (1992): 1 = sedimentary units; 2 = Od; 3 = Ogo; 4 = Yg; 5 = Xg; 6 = Xb; 7 = Xq; 8 = Xfh; 9 = Tki; 10 = Tgv; 11 = water)
SLOPE (approximate local slope, in degrees)
NOTES (well drillers' notes)

Dethier DP, Lazarus ED (2006) Geomorphic inferences from regolith thickness near the glacial limit, Boulder Creek catchment, Colorado, Geomorphology 75, 384–399

Green GN (1992) The digital geologic map of Colorado in ARC/INFO format, US Geological Survey Open-File Report 92-507.


This work was funded in part by NSF Grant #0106223, PRF Grant #36905-B8 and the Sperry Family Fund of Williams College.