Here's a few things I've learned about the best marine fossil sites. All the right ingredients need to come together in one spot for a great fossil site to come together. But I know there's much more than what I've listed below. So I was hoping other people could add to my list and correct anything they see that's amiss. I figure if your going to search for fossils, you might as well go with the best ideas in hand.
All the right ingredients typically found at a good Marine Fossil site:
* High elevation limestone shale cliffs, high elevation hill country or areas around ancient seabeds.
*Marine rocks in the area like limestone, basalt, dolomite , loess, silica.
*Excessive iron presence, magnesium, sulfur and copper carbon ore in the area is ideal.
*Presence of certain minerals like bertheirine and calcium carbonates.
*Evidence of trace fossils on the surface so you don't waste time digging in the wrong spot.
* Mud stone, clay, coral formations, or coral rocks.
* Rocks with flow lines, water marks, algae or microorganism markings.
*Evidence of oxidation or oxidized rocks.
Ross P. Anderson, Nicholas J. Tosca, Robert R. Gaines, Nicolás Mongiardino Koch, Derek E.G. Briggs. A mineralogical signature for Burgess Shale–type fossilization. Geology, 2018; DOI: 10.1130/G39941.1