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There is a stretch of super rocky embankment on our local Army Corps of Engineers built lake that has thousands of common marine fossils and slip rock fossils where these bolder configurations lay. My question is - A few of the huge boulders are blackened as if they had been exposed to fires while some that are planted nearby are white as can be so I am curious as to what could have caused this type of situation. Seems to me that a huge forest fire would have scorched the stones right next to the darker ones but it's not like that at all. The bank is littered with these huge boulders and are mixed charred blackened and snow white stone as noted in the attached pictures. I added a picture of the bank looking toward the water for further reference. The bank stretches just over a mile. I made the uneducated assumption that it was somehow related to the earthquake that occurred at the spot evidenced by the slip rock fossils that are littered all over the place that I am showing with the photo set but otherwise I have absolutely no clue.

I would like to get a I'd on a couple of ammonites I came across.