universalhub, to Massachusetts
@universalhub@mastodon.online avatar
Ceedave, to boston

View about eastward over Bay, on the left, just south of , USA
my
18/2 @ 5.6 1/950 s ISO 200 X-H1

Ceedave, to random

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).

My #photo. #Boston #geology #NewEngland #fieldTrip

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