My Fossil Collection
I have many fossils in my collection, but I have chosen my favorites to bring to you. I have also included some information about them.
Click on each thumbnail for an enlarged view.
Above is an opalized, pyritized ammonoid. This species of ammonoid is called
Quenstedticeras. It is a Russian ammoniod from the Jurassic period.
It was found along the Volga River.
The egg above is called a Septarian.
The second view is a close-up of the internal calcite crystals. It was
formed during the Cretaceous period (50-70 m.y.a.) when the Gulf of Mexico
reached what is now Southern Utah. When sea life that was killed during
volcanic eruptions started to decompose, they were chemically attracted to the
sediment around them and formed mud balls. As the ocean receded, the balls
were left to dry and crack in the sunlight. Due to their bentonite
content, they also shrank at the same time, trapping the cracks inside. As
decomposed calcite from the shells settled down into the cracks in the mud
balls, calcite crystals formed. A thin wall of calcite was transformed
into aragonite, separating the bentonite heavy clay exteriors from the calcite
centers. Because of this, the nodules are called septarians.
The word "septarian" is derived
from the Latin name, Septem, meaning seven. This relates to the fact that
the mud balls cracked with seven points in every direction, thereby creating the
Septarians are composed of calcite (the
yellow centers), aragonite (brown lines) and limestone (outer gray rock).
Occasionally, the fossil or some of the fossils which started the formation of
the rock is noticeable in the rock.
|This squared off block of limestone preserves two side by side specimens of the cystoid Pleurocystites filitextus. This cystoid species has fine lines preserved on the plates. The specimens here not only preserve that ornament but also three pore rhombohedrons each as well as a long pair of tentacles. A long-armed starfish is also preserved on the plate. It is from the Middle Ordovican, Bobcaygeon Formation.|
|This paw is from Ursus spelaeus, the extinct ice age cave bear. It is over 11 inches long. Over 10 feet tall, this bear lived 12,000-50,000 years ago.|
|Pinnixa galliheri rathbun (type of crab) Crab itself is approximately 3/4" wide Monterey Formation Aguajito Shale Member Miocene Age Carmel Valley, CA|
My best fossils are in my Trilobite collection. Click here to see my Trilobite Collection.
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