GLACIOLOGY: THE IMPACT OF SUBGLACIAL MELTWATER AT THE END OF THE ICE AGE
In June 2017, Geodoxa made a first 3D photogrammetric survey over the ancient gravel pit in Cantley, Quebec. A gigantic outburst of subglacial water eroded away many meters thick of marble of Grenville age (Precambrian). The marble contains harder volcanic inclusions more resistant to water abrasion leaving obstacle marks/tails on their lee side.
The Sun was high around 14h30 local time; the drone was flying 170.6m above sea level and 25m above the low flat ground of the quarry.