Browse Items (155 total)

(DSM# 10769) Mississippi is home to the largest deposits of petrified wood east of the Mississippi.

(unnumbered) Plant fossils can be extremely useful in studies to determine past climates. They can also be used to better understand the relationships between plants and insects.

(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…

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

(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.

(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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(DSM# 3353) During the Cretaceous rudists were major reef-forming organisms.

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