Economic geology. Old earth models work. In my case, the coal seams found in northern part of the Witbank Coalfield are very consistent with being deposited on deltas resulting from rivers flowing out of U-formed glacial valleys into a lake. And then the different types of vegetation forming the coal deposits and coal seams. And evidence for shore transgression and regression. Hence the different coal seams.
This would be interesting to understand better. What is it you find that tells you it was "deltas resulting from rivers flowing out of U-formed glacial valleys into a lake"?
Re: Great so far but I'm slow so humor me by expanding some.
Also you mentioned chemical and mechanical weathering in the context of the production of the sediment; but don't those processes also occur during and after lithification? And don't those characteristics give us clues as to the depositional environment?
Yes, however, the breakdown of rock to producing clastic sediments is kind of the opposite to lithification.
I guess I didn't understand the question. About chemical and mechanical weathering occurring during lithification, since lithification occurs after burial, how could there be any weathering? And about after lithification, can't weathering only occur after exposure?