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Fossil Bryozoan (Archimedes screw) - Dwardsville Formation, Mississippian, Carboniferous: Crawfordsville, Montgomery County, Indiana, USA

Fossil Bryozoan (Archimedes screw) – Dwardsville Formation, Mississippian, Carboniferous: Crawfordsville, Montgomery County, Indiana, USA

£24.00

Fossil Bryozoan – Archimedes Screw

Formation: Dwardsville Formation

Geological Period: Mississippian, Carboniferous (approximately 360 to 325 million years ago)

Location: Crawfordsville, Montgomery County, Indiana, USA

Certificate of Authenticity Included

Scale Rule Squares / Cube = 1cm

Full sizing details in the photo

This Fossil Bryozoan from the Dwardsville Formation in Crawfordsville, Indiana, USA is a classic example of an Archimedes screw bryozoan fossil. It dates back to the Mississippian period, within the Carboniferous era. The fossil exhibits the characteristic spiral structure of the Archimedes screw, which is named for its resemblance to the ancient screw mechanism invented by Archimedes.

Species and Morphology Information:

  • Species: Archimedes screw (a type of Bryozoan)
  • Geological Age: Mississippian, Carboniferous (~360 to 325 million years ago)
  • Depositional Environment: The Dwardsville Formation represents a marine environment in which Bryozoans flourished during the Mississippian period. These reef-building organisms lived in shallow, tropical seas. The Archimedes screw is a type of bryozoan that formed large, coiled, spiral-shaped colonies.
  • Morphology Features: This Bryozoan fossil exhibits the distinctive spiral shape of the Archimedes screw structure. These spiral structures were made up of calcite exoskeletons and grew in large colonies. The spiral coils are often preserved as fossils and are found in the Mississippian strata of the Dwardsville Formation. The fossil demonstrates intricate detail of the coiled structure, making it a fascinating specimen for study and collection.
  • Notable Features: The Archimedes screw bryozoan is rare and iconic for fossil collectors due to its distinctive spiral shape and the remarkable preservation of its structure. These fossils provide important insights into ancient marine ecosystems. This Archimedes screw fossil is a great example of marine life from the Carboniferous period.
  • Family: Archimedes
  • Superfamily: Bryozoa
  • Order: Cheilostomata
  • Biozone: The Dwardsville Formation in Crawfordsville, Indiana, is part of the Mississippian biozone, a marine biozone known for its abundance of marine invertebrates, including bryozoans, corals, and brachiopods. The Archimedes screw represents an important reef-building organism from the Mississippian seas.

Size and Visuals:

The Bryozoan fossil (Archimedes screw) measures approximately X inches/cm (as shown in the photos). The scale rule cube in the image represents 1cm, allowing you to accurately assess the size and proportions of the fossil.

Authenticity and Certification:

This Archimedes screw bryozoan fossil is 100% genuine and comes with a Certificate of Authenticity. The certificate confirms that the specimen was sourced from the Dwardsville Formation in Crawfordsville, Montgomery County, Indiana, USA, and dates back to the Mississippian period.

Why Buy This Fossil:

  • Authentic and Genuine: Comes with a Certificate of Authenticity confirming its US origin and Mississippian age.
  • Perfect for Collectors: A distinctive spiral-shaped fossil that will be a standout addition to any fossil collection, especially for those interested in Bryozoans and Mississippian fossils.
  • Educational Value: Provides an excellent opportunity to study ancient marine ecosystems from the Mississippian period and the fascinating structure of the Archimedes screw bryozoan.
  • Unique Display Piece: The spiral structure of this Bryozoan fossil makes it a visually striking piece for any fossil display or natural history collection.

Note: The photo shown is of the actual specimen you will receive. The scale cube in the image represents 1cm, and full-size details are provided through the photos.

(Actual as seen)

Only 1 left in stock

SKU: SF0832 Category:

Description

Fossil Bryozoan – Archimedes Screw

Formation: Dwardsville Formation

Geological Period: Mississippian, Carboniferous (approximately 360 to 325 million years ago)

Location: Crawfordsville, Montgomery County, Indiana, USA

Certificate of Authenticity Included

Scale Rule Squares / Cube = 1cm

Full sizing details in the photo

This Fossil Bryozoan from the Dwardsville Formation in Crawfordsville, Indiana, USA is a classic example of an Archimedes screw bryozoan fossil. It dates back to the Mississippian period, within the Carboniferous era. The fossil exhibits the characteristic spiral structure of the Archimedes screw, which is named for its resemblance to the ancient screw mechanism invented by Archimedes.

Species and Morphology Information:

  • Species: Archimedes screw (a type of Bryozoan)
  • Geological Age: Mississippian, Carboniferous (~360 to 325 million years ago)
  • Depositional Environment: The Dwardsville Formation represents a marine environment in which Bryozoans flourished during the Mississippian period. These reef-building organisms lived in shallow, tropical seas. The Archimedes screw is a type of bryozoan that formed large, coiled, spiral-shaped colonies.
  • Morphology Features: This Bryozoan fossil exhibits the distinctive spiral shape of the Archimedes screw structure. These spiral structures were made up of calcite exoskeletons and grew in large colonies. The spiral coils are often preserved as fossils and are found in the Mississippian strata of the Dwardsville Formation. The fossil demonstrates intricate detail of the coiled structure, making it a fascinating specimen for study and collection.
  • Notable Features: The Archimedes screw bryozoan is rare and iconic for fossil collectors due to its distinctive spiral shape and the remarkable preservation of its structure. These fossils provide important insights into ancient marine ecosystems. This Archimedes screw fossil is a great example of marine life from the Carboniferous period.
  • Family: Archimedes
  • Superfamily: Bryozoa
  • Order: Cheilostomata
  • Biozone: The Dwardsville Formation in Crawfordsville, Indiana, is part of the Mississippian biozone, a marine biozone known for its abundance of marine invertebrates, including bryozoans, corals, and brachiopods. The Archimedes screw represents an important reef-building organism from the Mississippian seas.

Size and Visuals:

The Bryozoan fossil (Archimedes screw) measures approximately X inches/cm (as shown in the photos). The scale rule cube in the image represents 1cm, allowing you to accurately assess the size and proportions of the fossil.

Authenticity and Certification:

This Archimedes screw bryozoan fossil is 100% genuine and comes with a Certificate of Authenticity. The certificate confirms that the specimen was sourced from the Dwardsville Formation in Crawfordsville, Montgomery County, Indiana, USA, and dates back to the Mississippian period.

Why Buy This Fossil:

  • Authentic and Genuine: Comes with a Certificate of Authenticity confirming its US origin and Mississippian age.
  • Perfect for Collectors: A distinctive spiral-shaped fossil that will be a standout addition to any fossil collection, especially for those interested in Bryozoans and Mississippian fossils.
  • Educational Value: Provides an excellent opportunity to study ancient marine ecosystems from the Mississippian period and the fascinating structure of the Archimedes screw bryozoan.
  • Unique Display Piece: The spiral structure of this Bryozoan fossil makes it a visually striking piece for any fossil display or natural history collection.

Note: The photo shown is of the actual specimen you will receive. The scale cube in the image represents 1cm, and full-size details are provided through the photos.

Additional information

Era

Carboniferous
Origin

USA

Carboniferous Information

The Carboniferous Period (359–299 million years ago) was a time of vast forests, giant insects, and the first reptiles. Named for its extensive coal deposits, this period saw lush swamps filled with towering lycophyte trees, ferns, and horsetails, which would later become today’s coal reserves. The climate was warm and humid, with high oxygen levels fueling the growth of giant arthropods like the dragonfly-like Meganeura and the massive millipede Arthropleura. Amphibians thrived in swampy environments, while the first reptiles evolved, laying eggs on land. In the oceans, sharks and early bony fish dominated, and corals flourished in warm, shallow seas. The period ended with a cooling climate and glaciation, leading to the drying of swamps and the decline of many species.

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