Notes specific to this specimen: Nice longitudinal colonies from the classic location of the old Mary Ellen Mine in Biwabik, Minnesota, the type locality for the Biwabik Iron Formation. The mine shut down over 50 years ago. We find these specimens in the old discard piles that surround the old pit. *This specimen comes with a Certificate of Authenticity and Origin

SIZE: 5.5″ x 6″ x 3/8″

Name: Collenia undosa
Unit: Biwabik Iron Formation
Site: Biwabik Iron Range, Minnesota
Date: Mid 1990s

Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.

Notes specific to this specimen: Beautiful deep red agatization in these cross-cut 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. The mine shut down over 50 years ago. We find these specimens in the old discard piles that surround the old pit. *This specimen comes with a Certificate of Authenticity and Origin.

SIZE: 4″ x 4″ x 1/8 – 3/8″

Name: Collenia undosa
Unit: Biwabik Iron Formation
Site: Biwabik Iron Range, Minnesota
Date: Mid 1990s

Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.

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 1990s

Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.

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 1990s

Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.