Raw GPR data for: Alluvial dynamics of a formerly glaciated Rocky Mountain headwater valley, Colorado

This dataset includes raw common-offset ground-penetrating radar (GPR) lines crossing the South Fork River Valley, Colorado (please see GPR_Profile_Line_Map.png for a figure detailing the line names and locations). These GPR lines were merged in processing to generated the Profiles (1-4) presented in the manuscript. We used a Sensors and Software DVL and 100 MHz frequency antennas spaced 1 m apart, arranged perpendicular to the direction of travel, with a trace spacing of 0.25 m along a reel tape placed along the transect path. A single Emlid Reach RS2 GPS receiver with an accuracy of 2.5 m was mounted to the GPR frame and recorded the position of each trace. Ringing artifacts from a metal GPS mount occurred on initial transects but the mount was subsequently replaced by a plastic mount. Frequency filtering was unsuccessful at removing instrument noise without removing the real signal observed close to the ground surface. Over 1.5 km of common offset GPR data were collected along the tr..., , # Alluvial dynamics of a formerly glaciated Rocky Mountain headwater valley, Colorado

Dataset DOI: [10.5061/dryad.d2547d8d3](10.5061/dryad.d2547d8d3)

## Description of the data and file structure

We used a Sensors and Software PulseEkko GPR system to conduct common offset surveys to create quasi two-dimensional images of the subsurface at transects crossing the South Fork River Valley. Common-offset GPR surveys image the subsurface at a resolution that documents vertical changes in subsurface characteristics, as captured via coring, but also the horizontal stratigraphy contained within the substrate. For common offset surveys, we used 100 MHz frequency antennas spaced 1 m apart, arranged perpendicular to the direction of travel, with a trace spacing of 0.25 m along a reel tape placed along the transect path. A single Emlid Reach RS2 GPS receiver with an accuracy of 2.5 m was mounted to the GPR frame and recorded the position of each trace. Ringing artifacts from a metal GPS mount occ...,