Snail and Clam internal casts
(DSM #M76 and #M172) These interal casts show the shape of the inside of a cavity such as a shell or brain. When you have an imprint of the outside of an organism it is calleda mold.
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“Fossilization - Steinkerns,” Mississippi State University Libraries, accessed August 11, 2022, https://msstate-exhibits.libraryhost.com/items/show/1661.
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