Between the last layer of Cretaceous rock and the first layer of Cenozoic rock, there is often a thinlayer of clay.
在最后一层白垩纪岩石和第一层新生代岩石之间,常常有一层薄薄的粘土。
3
Basal slip or sliding as it's often called, basically refers to the slipping or sliding of a glacier across bedrock, actually across a thinlayer of water on top of the bedrock.