Browse Items (156 total)

Plants Miss.jpg
Two flat, reddish stones that show deciduous leaves showing margins and veins.

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This map shows which parts of North America were inundated with water during the Cretaceous Period.

Embayment.jpg
Approximate placement of shorelines from the Cretaceous through the Pleistocene, showing the Mississippi Embayment.

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Thumbnail for insect fossil video

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Thumbnail of Fossilization Video

SD13 Septarian Concretion.jpg
(DSM #SD13) Septarian concretions form in cavities where the outer rock is cracked and angular. Minerals fill the cracks and preserve their shape.

SD11 SD12 concretions.jpg
(DSM #SD11 and #SD12) Concretions come in all sizes and are very often mistaken for fossils because of their intricate and strange shapes. They form when a grain of sediment or organism acts as a nucleus for minerals to precipitate and grow. Some…

SD8 Geode pseudofossil.jpg
(DSM #SD8) Geodes are crystals that form to fill a void. The outer portion of the stone is usually non-descript and plain but the crystals show themselves when the rock is hit with a hammer.

SD7 Dendrites.jpg
(DSM #SD7) Dendrites are iron or manganese oxide mineral growths that occur in a rock after deposition.

M76 M172 Steinkerns.jpg
(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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