A large, angular semi-pelite clast contains two tectonic fabrics, one of which is parallel to bedding within the clast whereas the other is oblique to it. |
A terminal grade is the smallest grain size to which an entrained clast may be reduced by crushing and abrasion under a glacier. |
A very few clast imbrications at Robins show transport from the north, suggesting that transport directions are also unchanged. |
Clast lithology map showing contoured percentages of Archean granitoid pebbles in till. |
Graded bedding, in which size decreases from bottom to top, is common: because agitated waters rarely subside at once, declining transport power causes a gradual upward decrease in maximum clast size. |
It is noteworthy that CLAST members will save money in adopting hands-on, inquiry-driven science kit curricula. |