North America, Western & Eastern United States, ca. 359,000,000–23,000,000 BCE. Two fossil plant specimens offered together, from very different eras. The first is foliage from a Dawn Redwood, Metasequoia occidentalis, preserved on tan matrix from the John Day Formation of central Oregon. The second is a Carboniferous shale slab bearing prehistoric fern species, their fronds preserved in striking white impressions against dark shale, the result of natural mineral alteration by pyrophyllite-rich fluids over 300 million years of burial. Together the two slabs span roughly 250 million years of plant evolution, from the coal swamp forests of the Pennsylvanian to the temperate woodlands of the Oligocene. Size: 3.5" W x 10" H (8.9 cm W x 25.4 cm H).

Provenance: private Colorado, USA collection

SHIPPING: We coordinate worldwide shipping in-house through specialist international forwarders experienced with fine art and antiquities customs manifests. International buyers must confirm, prior to bidding, that their country's customs authority will accept the item. All duties, taxes, clearance fees, and any costs arising from customs delays, seizures, re-export, returns, or loss in transit are the buyer's sole responsibility. Artemis assumes no liability for items refused entry, detained, or lost after export. We cannot ship ancient items to their country of origin (Egyptian to Egypt, Greek to Greece, etc.).

PAYMENT EXCEPTION: For clients not previously established with Artemis, payment for all gold, precious metal, and gemstone lots must be made by bank wire transfer or certified bank check/money order, without exception.

Item # 200548

  • Condition: Good. Some losses to peripheries.

Accepted Forms of Payment:

ACH, American Express, Discover, MasterCard, Money Order / Cashiers Check, Personal Check, Visa, Wire Transfer

Shipping

Auction House will ship, at Buyer's expense

by Artemis Fine Arts
June 25, 2026 9:00 AM MDT
686 S. Taylor Avenue
Suite 108
Louisville, CO, US 80027

Artemis Fine Arts

You agree to pay a buyer's premium of 30% and any applicable taxes and shipping.

View full terms and conditions

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