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Hello everyone! I recently found a small stone next to a newly dug road, and it is full of cross-sections of shells. I would clean it well first. But to emphasize the cross-sections, do you perhaps know of any way to paint only mineralized shells? So, for some kind of coloring - such that the quartz (I assume that the shells are mineralized into quartz?) absorbs and retains the color, and the basic medium - limestone, does not retain the color. That would be fantastic to see.. Thanks for every reply !

Apologies in advance for the large/unorganized pictures. I think it might be a walnut seed, but I'm not completely sure. I'm no expert on modern plants, let alone ones old enough to fossilize. It was found in the late 1980s/early 1990s. As a kid, I stumbled across it in a riverbed in Needmore, IN (USA). Mainly I wanted to post it as I'm guessing it is unusual to have half a fossilized seed that includes what I think is the nut part of the seed. This fossil was found in this condition (it wasn't cut open as far as I know). I'm guessing the green coloration in the interior is due to some sort of algae from the riverbed - I've never tried to clean it out (and probably never will).

I found this rock on a Lake Ontario beach in New York. I'm primarily curious about the heart-shaped outlines. Thanks!

Found what appears to be a cross-section of a Clypeaster fossil in Pliocene sea deposits, on the Greek island of Kythera. The length is 16 cm. Any help and suggestions on the species would be much appreciated!

No clue on this 2-inch (5cm) mystery invertebrate in a cross-section of rudist-bearing Cretaceous limestone. Origin unknown, since the photo is from a Chicago CTA station, not a proper outcrop. Any insights appreciated! but please provide your reasoning or evidence.

Most of my fossil collecting has been Invertebrate Macrofossil collecting. Very little attention has been made to the little fossils. It is always a good idea to expand your knowledge, leave your comfort zone, go somewhere you have never been before. I find that not paying much attention to Microfossils has been a mistake. So when I saw an interesting Nummulites fossil slab for sale; I chose to purchase it. The rough cut specimen looked like it could reveal more, with a little attention. What I chose to do is give it a good high luster lap polish to see the results. So much more detail was made. Where my specimen came from was Northern Spain, in or near the Pyrenees Mtns. near Aragon. The seller didn't give much info and what he did give was in Spanish. Chasing information down on the internet I found the mixed fossils were Nummulites sp. (large ones) and Alveolina sp. (smaller ones) I have some photos of my results to share. Before polishing it looked like this: After polishing the fossils clarified, here are some closeups: Apparently these fossils are common in Spain, neighboring France and other places in the world. This is an old engraving: In Spain, the Limestone the Nummulites are in, is used as building materials like blocks, steps, pavers. I will need to do more studying of these neat looking spiral tests.