Browse Items (155 total)

(DSM #3054) Horse molars are very long with a flat chewing surface.

(DSM #3055) This horse tooth has tooth marks from a rodent that gnawed on the tooth after the horse died. Rodents chew on hard items to keep their teeth healthy.

(DSM #M261) This extinct genus of Nautilus lived in seas from the Late Jurassic until the Miocene.

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(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.

(unnumbered) Compression fossils most often form in sedimentary rocks called shales which form in the bottom of lake or sea beds. The same fossil can be seen in both the part and counterpart but different features are often preserved on both sides.…

(DSM #PL58) This section of palm wood very clearly shows how individual cells of an organism can be filled with minerals in the process of permineralization.

(unnumbered) Petrified wood often exhibits a combination of replacement and permineralization. This specimen clearly shows how the cell walls have been replaced with minerals. The cells themselves are also filled in some cases.

(DSM #M410) This Turritellid snail has been completely replaced with the mineral pyrite. Some pyrite nodules have also begun to form and grow.

(DSM #10565) This brachiopod has had its shell partially replaced by the mineral pyrite. Pyrite is also known as fool's gold.