Lot 124A

For Prehistoric Fossilized Sand Dollars & Sea Urchins

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For Prehistoric Fossilized Sand Dollars & Sea Urchins

Estimate: $450 - $675

Starting Bid: $200

(0 Bids)

June 5, 2026 9:00 AM MDT
Live Auction
Louisville, CO, US

Description:

Prehistoric Seas, Paleozoic to Cenozoic Era, ca. 400 million to 2.6 million years ago. A collection of four fossilized echinoderms comprising prehistoric sea urchins and sand dollars, two preserved within natural stone matrix and two fully excavated and free-standing. The flattened sand dollars display the characteristic five-petal petaloid pattern radiating across their discs, a remnant of the living animal's structure, while their smooth surfaces reflect the loss of delicate spines after burial and fossilization, preserving the iconic star-like design in stone. Size of largest: 3.5" L x 3" W x 3" H (8.9 cm x 7.6 cm x 7.6 cm)

Provenance: private Colorado, USA collection

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Item # 200546

  • Condition: Domed fossil in gray matrix is reattached to the stone, with faint breakline along the base / attachment point. White matrix has multiple fossils embedded in it. Yellow fossil is polished and lustrous. Largest has stable fissures across the surface.

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Bid Increments
From: To: Increments:
$0 $299 $25
$300 $999 $50
$1,000 $1,999 $100
$2,000 $4,999 $250
$5,000 $9,999 $500
$10,000 $19,999 $1,000
$20,000 $49,999 $2,500
$50,000 $99,999 $5,000
$100,000 $199,999 $10,000
$200,000 + $20,000