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Iron Stromatolites (ME4)
Notes specific to this specimen: Rare white colonies with dark banded growth rings. Some have branchings. Specimen found in 1990s at the old Mary Ellen Mine in Biwabik, Minnesota, the type locality for the Biwabik Iron Formation. Notice the silvery spots of concentrated iron between the colonies.
SIZE: 5″ x 7″ x .3″
Name: Collenia undosa
Unit: Biwabik Iron Formation
Site: Biwabik Iron Range, Minnesota
Date: Mid 1990sDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$450.00Iron Stromatolites (ME4)
$450.00 -
Iron Stromatolites (ME5)
Notes specific to this specimen: Beautiful deep red agatization in these colonies attest to the classic origin of this specimen as being from the old Mary Ellen Mine in Biwabik, Minnesota, the type locality for the Biwabik Iron Formation. Notice the off-set angle of the growth pattern in this piece. This is attributed to constant water currents in the area where these colonies were growing.
SIZE: 4″ x 8″ x .3″
Name: Collenia undosa
Unit: Biwabik Iron Formation
Site: Biwabik Iron Range, Minnesota
Date: Mid 1990sDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$365.00Iron Stromatolites (ME5)
$365.00 -
Kona Dolomite (KONA10)
Notes specific to this specimen: This is an excellent sliced section showing multiple stromatolite colonies with distinct layers (laminae). The clear layering is unusual for this slightly metamorphosed material. It has a smooth back and a flat bottom so it stands up nicely.
SIZE: 6″ x 3″ x 1″
NAME: Collenia kona
AGE: Paleoproterozoic Era 2.3 billion years
UNIT: Kona Formation
SITE: Kona Hills, Michigan
DATE: 2023Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$185.00Kona Dolomite (KONA10)
$185.00 -
Kona Dolomite (KONA9)
Notes specific to this specimen: This is an excellent sliced section showing multiple stromatolite colonies with distinct layers (laminae). The clear layering is unusual for this slightly metamorphosed material. It has a smooth back and a flat bottom so it stands up nicely.
SIZE: 6″ x 3″ x 1″
NAME: Collenia kona
AGE: Paleoproterozoic Era 2.3 billion years
UNIT: Kona Formation
SITE: Kona Hills, Michigan
DATE: 2023Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$245.00Kona Dolomite (KONA9)
$245.00 -
Potomac Marble Sculpture
Notes specific to this specimen: You won’t find this on the market anywhere! Why? Because we are the only people who excavate and sculpt this beautiful and unusual historic material. Also called Capitol Marble, this Triassic conglomerate is featured as the columns in the US Capitol National Statuary Hall rotunda. They hold up the main Capitol Dome. Interestingly, the location of the quarry where this material was mined was lost for 200 years. But the old quarry site was finally found a few years ago. We visited the site which is along the C & O canal (near milepost 38) in 2024. It hosts the exact same rock we collect for carving at Point of Rocks, some 12 miles upstream where this piece is from. This freeform was sculpted by Jon in 2022 and has a flat bottom for easy display. It features a highly polished partial helix on the front and a contrasting natural back, showing how the rock is found in its rough state.
HOW IT FORMED
Paleozoic mountains that were being uplifted during the Triassic Period as North America and Africa were colliding. About 205 million years ago these rivers carried broken pieces of dolomite into a basin where they were buried. As the layers accumulated in depth, heat and pressure built up and eventually cemented everything together. Later the layers were pushed up and erosion removed the sediments above, exposing this unique rock in certain locations along the Potomac River.
SIZE: 6″ x 4″ x 6″
AGE: Triassic Period, 205 million years
UNIT: Newark Supergroup
SITE: Point of Rocks, Maryland
DATE: 2021Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$525.00Potomac Marble Sculpture
$525.00 -
Rainbow Stromatolite (RS1)
Notes specific to this specimen: This is one of the original discovery pieces, collected by us in August 2025. It is characteristic of all the variety of colors found in this site. We’ve never seen such a variety of colors of stromatolite from a single site. It reminded us of all the colors of Arizona petrified wood – known as “Rainbow Wood” – and this became the source for our naming this new discovery “Rainbow Stromatolite”.
SIZE: 2″x 4″x 1.5″
Name Collenia sp. (possible new species)
Age Anamikean / Paleoproterozoic – 1.88 billion years
Unit Gunflint Iron Formation
Site Ontario, Canada
Date 2025Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$285.00Rainbow Stromatolite (RS1)
$285.00 -
Rainbow Stromatolite (RS2)
Notes specific to this specimen: Another one of the original discovery pieces, collected by us in August 2025. Unusual wine coloring with distinct colonies.
SIZE: 1.5″x 4″x .5″
Name Collenia sp. (possible new species)
Age Anamikean / Paleoproterozoic – 1.88 billion years
Unit Gunflint Iron Formation
Site Ontario, Canada
Date 2025Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$110.00Rainbow Stromatolite (RS2)
$110.00 -
Rainbow Stromatolite (RS3)
Notes specific to this specimen: Another one of the original discovery pieces, collected by us in August 2025. Deep red colonies surrounded by high iron hematite matrix.
SIZE: 2″x 2.58″x .75″
Name Collenia sp. (possible new species)
Age Anamikean / Paleoproterozoic – 1.88 billion years
Unit Gunflint Iron Formation
Site Ontario, Canada
Date 2025Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$120.00Rainbow Stromatolite (RS3)
$120.00 -
Rainbow Stromatolite (RS4)
Notes specific to this specimen: Another one of the original discovery pieces, collected by us in August 2025. Unique honey-color colonies with unusual dark laminae. Never seen anything like this!
SIZE: 2″x 2″x .75″
Name Collenia sp. (possible new species)
Age Anamikean / Paleoproterozoic – 1.88 billion years
Unit Gunflint Iron Formation
Site Ontario, Canada
Date 2025Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$165.00Rainbow Stromatolite (RS4)
$165.00 -
Rainbow Stromatolite (RS5)
Notes specific to this specimen: Another one of the original discovery pieces, collected by us in August 2025. Wild contrasts in the colors of these colonies.
SIZE: 2″x 4″x .5″
Name Collenia sp. (possible new species)
Age Anamikean / Paleoproterozoic – 1.88 billion years
Unit Gunflint Iron Formation
Site Ontario, Canada
Date 2025Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$150.00Rainbow Stromatolite (RS5)
$150.00 -
Septarian Nodule Bowl
Notes specific to this specimen: An entirely unique item, this septarian nodule was excavated and carved into a bowl by Jon in 2018. The specimen is from the famous Muddy Creek septarian beds in southern Utah, east of Zion National Park. Our friends own a mining claim there and we periodically visit them to collect nodules. Most septarians are not conducive to carving into bowls. This is the only septarian nodule bowl ever sculpted by Jon. He kept it as his own since the day he sculpted it. Alas, it is being displaced from his personal collection by other, larger projects. It has a beautiful shine and fluoresces nicely under UV light. Jon has indicated he may – or may not! – ever do another one.
SIZE: 6″ x 6″ x 4″
SEPTARIAN NODULE BOWL
AGE: Cretaceous Period, 70 million years
UNIT: Frontier Formation
SITE: Orderville, Utah
DATE: 2018Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$485.00Septarian Nodule Bowl
$485.00 -
Volcanic Bomb (EB1)
Notes specific to this specimen: Large, excellent, classic fusiform bomb with superb aerodynamic striations. Natural split reveals chalcedony interior which fluoresces a vibrant green. This specimen is first class.
SIZE: 12″ x 5″ x 4″
NAME: Various forms
AGE: Pliocene Epoch- 5 million years
UNIT: Banbury Formation
SITE: Elko County, Nevada
DATE: 2020Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$585.00Volcanic Bomb (EB1)
$585.00