Fossil Ammonites, Fish, Orthoceras,
Trilobites and Other Fossils

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$200.00 FO400c   Here is an above average quality, colorful Ammonite set from Madagascar. It measures 7 3/4" x 6 1/2" x  1 5/8" thick. The specimen has a nice polish on the inside with some iridescence on the equally nicely polished outside.  The Ammonite has a highly detailed interior with some nicely crystallized partitions of  Yellow Calcite.  A super fossil!!

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Click here for more like this.!!!

Ammonites are extinct members of the cephalopod group of mollusks. Only a limited number of species have survived to the present day which includes the squid and the chambered nautilus. Ammonites had a multi-chambered shell, and added more chambers as it grew, always living in the outer chamber.  They lived in the Cretaceous period some 63 to 130 million years ago.

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Ammonite

$45.00 FO401c  This is a smaller Ammonite fossil resting in a bed of Grey Shale matrix.   The Ammonite measures 2" x 2 1/4" and the matrix measures 4" x 4 1/2" x 1 3/8".  Close observation will reveal several smaller and/or partial other fossils in the matrix.  This would make a great gift or exceptional educational too.

Ammonites lived in the Cretaceous period some 63 to 130 million years ago.  Great for any collection.  Each set is a one of a kind and cannot be duplicated.

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Ammonite

$90.00 FO402b  This is an exceptional, high quality fossilized Starfish in matrix from Morocco.  The Starfish measures approximately 5" x 4" in diameter in a fossilized matrix measuring 6 5/8" x 6 1/4" x 7/8" thick.   This is from the Ordovician Period some 450 to 510 million years ago and was found in the Atlas Mountain region of Sahara Desert. As with all fossils found there is some repair needed after the excavation, Very nice!

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Starfish Fossil

$50.00 FO403b   This is a very nice fossilized Coral specimen from Indonesia. This unique specimen measures 6 5/8" x 4" x 4 1/8" thick and weighs nearly 3 1/4 lbs.  This very interesting fossil shows great character as shown in pictures linked below. This particular piece was cut and polished right here in our very own Fossil and Lapidary Department exposing the wonderful color and design locked in this fabulous fossil.  A must have for the fossil collector or an excellent gift for someone!

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Coral is built by secreting calcium carbonate skeletons. Hard coral is fossilized over millions of years. It can be almost any color. The stony Corals are often found in Coral reefs, large structures generally found in tropical waters. Reefs are extremely diverse consisting of over 4,000 species of fish, cnidarians, mollusks, crustaceans, and other animals.

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Fossil Coral

$60.00 FO404c   Here is a nice, high quality Green River Fossil still entombed the matrix shale.  Which actual fossil remains undetermined until you carefully expose it.  It is estimated you will spend from 15 to 35 hours to gently remove the shale to expose the fossil.  The fossil looks like it will measure approximately 3 3/4" x over 2 1/2" and is in matrix that is 10 3/4" x nearly 9" x over 3/8" thick.  The fossil comes with a tool and information sheet containing fossil exposure instructions and tips.  These fossils make great gifts or work wonderful as an educational tool for school, scouts or clubs. 

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In southwest Wyoming (and parts of Colorado and Utah) in the Green River Formation are found some of the world's most outstanding specimens of fossil fish.  The Green River system was composed of three lakes:  Lake Ulinta, Lake Gosiute and Fossil Lake.  These Eocene Lakes lay in a series of intermountain basins formed by geological events that uplifted the Rocky Mountains during the early Tertiary time.
The Climate was much different from the desert-like climate of this area today.  Both the fauna (crocodiles, alligators, boa constrictors and some subtropical fish families) and the flora (such as large palm trees) indicate a climate much like that found along the Gulf Coast today. 

The most common fish found in the formation is the Knightia, a herring-like fish.  They are found singularly or in large groupings. These groupings are referred to as "Mortality Layers" and are believed to have been caused by extensive ash fall-out after volcanic eruptions. Some of the other species of fish found in the Green River Formation are:  Phareodus, a carnivorous fish often found up to 2 feet in length and having many sharp teeth.  Mioplosus, a true perch, and Priscacara, a sunfish-like fish with stout dorsal and anal spines.  There are also turtles, stingrays, crocodiles and alligator gar-fish.

The fossils of the Green River Formation - each one unique - are some of nature's finest art.  They are highly valued by collectors the world over.

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Green River Fossil

$85.00 FO405b  This is a very nice fossil specimen of Orthoceras fossils from Morocco on a medium sized matrix plaque.  The detailed Orthoceras fossils were carefully exposed from the rock surrounding them.  The all natural and unpolished plaque measures 9 3/8" x over 6 3/4" x almost 2" and weighs nearly 4 1/4 lbs.  The fossils on this fossil plaque are as described below and are from Morocco.

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These Moroccan fossils are among the oldest cephalopods.  They were abundant during the Paleozoic era some 350 MM years ago and now make up the Atlas Mountain range of central Morocco. There were two Nautiloid forms present in the Moroccan Devonian sea.  The Goniatites is an extinct relative of the Ammonites,  it possessed an external shell, which is has a spiral form with internal chambers. The Orthoceras was straight shelled cephalopod with the internal chambers. They were related to the modern day chambered nautilus and the squid.

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Orthoceras Plaque

$25.00 FO406b  This is a fossilized Trilobite in matrix from Morocco.  The very detailed Trilobite specimen measures almost 2 1/4" long x 1 1/2" wide.  The specimen is in matrix that is over 5" x almost 2 7/8" x 1 7/8" thick.  A very cool fossil for you to enjoy.

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Trilobites are hard-shelled, segmented members of Arthropoda and the class Trilobita that existed throughout almost all of the Paleozoic era, flourishing in the earlier part of it and slowly declining in the later part. The most common trilobites were about 2-7 cm (1-3.5 in) in length, but over their long history they ranged in size from 1 mm-72 cm (.04 in-28 in) and exhibited so much variation that they are classified into nine (or possibly ten) orders with more than 15,000 species. The smallest species are presumed to have been part of the free floating plankton, while the more common, mid-sized species probably walked along the sea floor filtering mud to obtain food, and the larger varieties may have been swimming predators.

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Trilobite

$40.00 FO407c   This is a Calymene Celebra Trilobite of the Phacopida group in matrix from Morocco.  The detailed Trilobite measures 1 7/8" x 1".  The matrix measures 2" x 1 5/8" x 1 5/8"and has not been polished.  Very nice. 

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Trilobites are hard-shelled, segmented members of Arthropoda and the class Trilobita that existed throughout almost all of the Paleozoic era, flourishing in the earlier part of it and slowly declining in the later part. The most common trilobites were about 2-7 cm (1-3.5 in) in length, but over their long history they ranged in size from 1 mm-72 cm (.04 in-28 in) and exhibited so much variation that they are classified into nine (or possibly ten) orders with more than 15,000 species. The smallest species are presumed to have been part of the free floating plankton, while the more common, mid-sized species probably walked along the sea floor filtering mud to obtain food, and the larger varieties may have been swimming predators.

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Trilobite

$25.00 FO408b  Here's something new, an awesome Fossil Coral from right here in South Dakota.  This unique specimen measures approximately 3 1/4" x 3 1/4" x 3". This very interesting fossil shows great character as shown in pictures linked below.  A must have for the fossil collector or an excellent gift for someone!

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Coral is built by secreting calcium carbonate skeletons. Hard coral is fossilized over millions of years. It can be almost any color. The stony Corals are often found in Coral reefs, large structures generally found in tropical waters. Reefs are extremely diverse consisting of over 4,000 species of fish, cnidarians, mollusks, crustaceans, and other animals.

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South Dakota Fossil Coral

$65.00 FO409c   Here is an very interesting Ammonite Fossil from Morocco.  The exterior has been smoothed and polished to show the detail  of the suture lines of the of the shell. It measures nearly 4 3/4" x over 3 3/4" x 1 1/8".  A nice fossil for any fossil collector.

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Ammonites are extinct members of the cephalopod group of mollusks. Only a limited number of species have survived to the present day which includes the squid and the chambered nautilus. Ammonites had a multi-chambered shell, and added more chambers as it grew, always living in the outer chamber.  They lived in the Cretaceous period some 63 to 130 million years ago.

ammonite

Ammonite

$200.00 FO410c  Here's a rare item we don't see that often, a Cycad from South Dakota. It measures 4 1/4" X 3 3/4" X 1 1/8" and has been polished on the front face to show it's great detail.  A truly fabulous specimen in excellent condition.

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Cycads are seed plants with a very long fossil history that were formerly more abundant and more diverse than they are today. They typically have a stout and woody trunk with a crown of large, hard and stiff, evergreen leaves. They usually have pinnate leaves.

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South Dakota Cycad

$80.00 FO411c  This is a larger, above average quality specimen of Petrified Wood from the Northwestern United States.  The pretty measures almost 6 3/4" wide x over 6 5/8" x 1/2" thick.  The Petrified Wood has a nice blend of Browns and Earth tone colors with a great design and lots of character.  The top has been highly polished leaving the outer bark in it's natural petrified state. It has a very different, irregular shape and very nice design. 

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Petrified Wood is a type of a fossil as it consists of fossil wood where all the organic materials have been replaced with minerals while retaining the original structure of the wood.  These minerals are most often Silicates such as Quartz.  Other minerals, Manganese, Iron and Copper, in the water or mud during the petrification process give Petrified Wood a variety of color ranges: black - Carbon; green/blue - Copper; red/brown/yellow - Iron.  Petrified Wood can preserve the original structure of the wood in all its detail all the way down to the microscopic level.  Structures such as tree rings and the various tissues are often observed features.  Although Petrified Wood can be found worldwide, it is rather rare in larger quantities and at times can be difficult to obtain by the average collector.

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Petrified Wood

$85.00 FO412c This is a very nice fossilized Orthoceras collage from Morocco from the Silurian Age about 400 million years ago.  The specimen has many highly detailed Orthoceras fossils in various sizes scattered throughout as well as several ocean animals.  Overall, the matrix measures 9 5/8" x 7 1/2" x 1 3/4" thick and is not polished.  Very cool!

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Orthoceras was a marine cephalopod, this particular species was straight shelled and they thrived some 400+ million years ago in the Paleozoic era. 

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Orthoceras Collage

$110.00 FO413b   Here is something different for the fossil collector.  This is a larger, above average quality, fossilized Trilobite from Morocco. The species is Phacops from 430 to 360 million years ago.  The Trilobite measures 4 3/8" long x 2 3/4" wide.  The matrix overall measures approximately 4 5/8" x almost 4 1/8" x nearly 2 3/4".  Close inspection does show some minor repairs and is reflected in our price. A very nice fossil.

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Trilobites are hard-shelled, segmented members of Arthropoda and the class Trilobita that existed throughout almost all of the Paleozoic era, flourishing in the earlier part of it and slowly declining in the later part. The most common trilobites were about 2-7 cm (1-3.5 in) in length, but over their long history they ranged in size from 1 mm-72 cm (.04 in-28 in) and exhibited so much variation that they are classified into nine (or possibly ten) orders with more than 15,000 species. The smallest species are presumed to have been part of the free floating plankton, while the more common, mid-sized species probably walked along the sea floor filtering mud to obtain food, and the larger varieties may have been swimming predators.

trilobite

Trilobite

$225.00 FO420c   Here is something different from the Rock Shed's Fossil department.  This is an exceptionally nice Fossil Leaf specimen that we believe is from the Hell Creek Formation in Montana. This very cool specimen has at least eight leaves of three different trees. The one at the top center left in the picture to the right appears to be from a Dawn Redwood (Metasequoia) and measures 2" long x 3/4" wide. The others look to be from Willow and Poplar like trees and possibly Sumac.  We found another neat fossil on the back of this specimen; what appears to be a Mosquito type insect. This extremely nice fossil specimen is in a light colored limestone matrix measuring approximately 17 1/2" wide x 11 3/4" x almost 1 1/4" thick and weighs over 12 1/2 pounds.  A very, very nice fossil!

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Fossil Leaves

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