Chris White · @Ceedave
124 followers · 231 posts · Server sciencemastodon.com
The #glacier went that-a-way
The #striations on this face of the #Ediacaran (ca. 560 Ma) #Squantum Member of the #Roxbury #Conglomerate were probably left by the #Pleistocene #Laurentide ice sheet, which retreated ca. 12 ka. The striations have the right orientation, from northwest to southeast.
The Squantum Member was once interpreted as a (#glacial) #tillite. The most common contemporary model is a peri-#Gondwana #debrite (#turbidite).
#Glacier #striations #ediacaran #squantum #roxbury #conglomerate #Pleistocene #laurentide #glacial #tillite #gondwana #debrite #turbidite #photo #boston #geology #newengland #fieldtrip