I want to know the answer to the following question:
What did silt and marine fossils teach Shen Kuo?
All the background I'm provided with is that "After observing the natural process of the inundation of silt and the find of marine fossils in the Taihang Mountains (hundreds of miles from the Pacific Ocean), Shen Kuo devised a theory of land formation, or geomorphology.". Is that enough to answer the question?