Browse Items (155 total)

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.

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

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.

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…

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.
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