-
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 (KONA21)
Notes specific to this specimen: Some Kona Dolomite we have carved into various shapes to accentuate the colors and patterns. Classic pyramid shape with nice deep red iron oxide coloration. Polished all the way around – on all sides and base.
SIZE: 2.75″
NAME: Collenia kona
AGE: Paleoproterozoic Era 2.3 billion years
UNIT: Kona Formation
SITE: Kona Hills, Michigan
DATE: 2025
BY: Jon Kramer & Julie MartinezDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$112.00Kona Dolomite (KONA21)
$112.00 -
Kona Dolomite (KONA22)
Notes specific to this specimen: Some Kona Dolomite we have carved into various shapes to accentuate the colors and patterns. Classic pyramid shape with nice deep red iron oxide coloration. Polished all the way around – on all sides and base.
SIZE: 2.75″
NAME: Collenia kona
AGE: Paleoproterozoic Era 2.3 billion years
UNIT: Kona Formation
SITE: Kona Hills, Michigan
DATE: 2025
BY: Jon Kramer & Julie MartinezDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$112.00Kona Dolomite (KONA22)
$112.00 -
Kona Dolomite (KONA23)
Notes specific to this specimen: Some Kona Dolomite we have carved into various shapes to accentuate the colors and patterns. This is a traditional Zuni pueblo fetish bear shape with nice banding showing the stromatolite layering. Polished on both sides, with a flat base so it stands up easily.
SIZE: 3.5″
NAME: Collenia kona
AGE: Paleoproterozoic Era 2.3 billion years
UNIT: Kona Formation
SITE: Kona Hills, Michigan
DATE: 2025
BY: Jon Kramer & Julie MartinezDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$85.00Kona Dolomite (KONA23)
$85.00 -
Kona Dolomite (KONA24)
Notes specific to this specimen: Some Kona Dolomite we have carved into various shapes to accentuate the colors and patterns. This is a traditional Zuni pueblo fetish bear shape with nice banding showing the stromatolite layering. Polished on both sides, with a flat base so it stands up easily.
SIZE: 4″
NAME: Collenia kona
AGE: Paleoproterozoic Era 2.3 billion years
UNIT: Kona Formation
SITE: Kona Hills, Michigan
DATE: 2025
BY: Jon Kramer & Julie MartinezDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$85.00Kona Dolomite (KONA24)
$85.00 -
Kona Dolomite (KONA25)
Notes specific to this specimen: Some Kona Dolomite we have carved into various shapes to accentuate the colors and patterns. This obelisk shows lively color and great patterning that is present in the better pieces of this unique material. Polished on all sides, with a flat base so it stands up easily.Â
SIZE: 4.5″
NAME: Collenia kona
AGE: Paleoproterozoic Era 2.3 billion years
UNIT: Kona Formation
SITE: Kona Hills, Michigan
DATE: 2025
BY: Jon Kramer & Julie MartinezDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$95.00Kona Dolomite (KONA25)
$95.00 -
Kona Dolomite (KONA26)
Notes specific to this specimen: Some Kona Dolomite we have carved into various shapes to accentuate the colors and patterns. This obelisk shows lively color and great patterning that is present in the better pieces of this unique material. Polished on all sides, with a flat base so it stands up easily.
SIZE: 5″
NAME: Collenia kona
AGE: Paleoproterozoic Era 2.3 billion years
UNIT: Kona Formation
SITE: Kona Hills, Michigan
DATE: 2025
BY: Jon Kramer & Julie MartinezDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$110.00Kona Dolomite (KONA26)
$110.00 -
Kona Dolomite (KONA27)
Notes specific to this specimen: Some Kona Dolomite we have carved into various shapes to accentuate the colors and patterns. This obelisk shows lively color and great patterning that is present in the better pieces of this unique material. Polished on all sides, with a flat base so it stands up easily.
SIZE: 5″
NAME: Collenia kona
AGE: Paleoproterozoic Era 2.3 billion years
UNIT: Kona Formation
SITE: Kona Hills, Michigan
DATE: 2025
BY: Jon Kramer & Julie MartinezDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$110.00Kona Dolomite (KONA27)
$110.00 -
Kona Dolomite (KONA28)
Notes specific to this specimen: Some Kona Dolomite we have carved into various shapes to accentuate the colors and patterns. This obelisk shows lively color and great patterning that is present in the better pieces of this unique material. Polished on all sides, with a flat base so it stands up easily.
SIZE: 6″
NAME: Collenia kona
AGE: Paleoproterozoic Era 2.3 billion years
UNIT: Kona Formation
SITE: Kona Hills, Michigan
DATE: 2025
BY: Jon Kramer & Julie MartinezDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$130.00Kona Dolomite (KONA28)
$130.00 -
Kona Dolomite (KONA31)
Notes specific to this specimen: We cut and polish these particular Kona Dolomite pieces to showcase the uniqueness of this material. Here the front is cut and polished. It sits upright on a flat base with a slight angle for optimal viewing. The back is left rough. This piece shows nice stromatolitic banding. There is some slight marring in the finish at the top.  Great conversation piece of one of the world’s oldest fossils.Â
SIZE: 2″ High
NAME: Collenia kona
AGE: Paleoproterozoic Era 2.3 billion years
UNIT: Kona Formation
SITE: Kona Hills, Michigan
DATE: 2025
BY: Jon Kramer & Julie MartinezDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$35.00Kona Dolomite (KONA31)
$35.00
Shop Our Catalog
- Browse All Products
- Agatized Algae
- Agatized Coral
- Cerdito Prospect Rift Crystals
- Rucks Pit
- Dinosaur Bones
- Exceptional Museum Specimens
- Fossil Echinoids
- Fossil Fern
- Fossil Fish
- Gunflint Iron Rainbow Stromatolite
- Gypsum Selenite
- Iron Range Stromatolites
- Kettleman Hills Fossils
- Kona Dolomite
- Specularite
- Sudbury Impactite
- Trilobites
- Volcanic Bombs
