usgsdrill-hole data, in feet. gl—ground level elevation r—rock interval c—coal interval nr-n0...

1

Upload: others

Post on 15-Aug-2021

0 views

Category:

Documents


0 download

TRANSCRIPT

Page 1: USGSdrill-hole data, in feet. GL—Ground level elevation R—Rock interval C—Coal interval NR-N0 Record TD-T0tal depth DRILL-HOLE DATA SYMBOLS *—Measured coal thickness ND—No