Skip to main content
Go to accessibility options

Peak season notice: Shipping for this category may take 14–21 business days after cleared payment. Thanks for your patience.

Description

Ammonite Fossil Mass Mortality Cluster
Indosphinctes sp.
Middle Jurassic
Russia

This striking fossil assemblage captures a dramatic moment frozen in time-a mass mortality event featuring over a dozen Indosphinctes Ammonites, preserved together in a single matrix. Varying in size and orientation, the Ammonites exhibit lustrous pearlescent and iridescent surfaces, highlighting fine shell detail and natural color play across the fossilized exoskeletons. The largest Ammonite in the cluster measures an impressive 7 inches (18 cm) in diameter, making this a visually dynamic and scientifically compelling specimen. Such groupings provide rare insights into paleoecological conditions and are highly sought after for both their aesthetic beauty and paleontological importance.
Overall Measurements: 13.00 x 10.00 x 5.50 inches (33.02 x 25.40 x 13.97 cm)

Provenance: Property of a Distinguished Southern California Collector


More Information: All items are offered "as is." While every effort has been made to accurately describe each lot, certain pieces—particularly fossils, minerals, and carvings—may exhibit minor imperfections, repairs, restorations, or natural wear consistent with age, excavation, or handling. Prospective buyers are encouraged to carefully review photographs and descriptions and to request additional condition information prior to bidding.


Estimate: $1,200 - up.

Condition Report*: Condition report available upon request.
*Heritage Auctions strives to provide as much information as possible but encourages in-person inspection by bidders. Statements regarding the condition of objects are only for general guidance and should not be relied upon as complete statements of fact, and do not constitute a representation, warranty or assumption of liability by Heritage. Some condition issues may not be noted in the condition report but are apparent in the provided photos which are considered part of the condition report. Please note that we do not de-frame lots estimated at $1,000 or less and may not be able to provide additional details for lots valued under $500. Heritage does not guarantee the condition of frames and shall not be liable for any damage/scratches to frames, glass/acrylic coverings, original boxes, display accessories, or art that has slipped in frames. All lots are sold "AS IS" under the Terms & Conditions of Auction.

Auction Info

Proxy Bidding Ends 
December
2nd Tuesday 3:50 pm CT
Auction Dates
December
2nd Tuesday
Proxy Bidding Time Remaining 
10 Days 10h 14m
Bids + Registered Phone Bidders: 0
Lot Tracking Activity: 9
Page Views: 57

Buyer's Premium per Lot:
25% of the successful bid (minimum $49) per lot.

This lot is in: 2 - Signature® Internet Session - No Floor or Phone Bidding (Mail, Fax, Internet, and Heritage Live):
(Lots 72188-72346) - 4:00 PM Central Time, Tuesday, December 2, 2025.
[Proxy bidding ends ten minutes prior to the session start time. Live Proxy bidding on Heritage Live now starts within 2 hours of when the auction opens for proxy bidding and continues through the live session.]

Show All Session Information

Show Auction Type Info

Exhibition Viewing Times, Title Page, Floor Session and License Information

Additional Location Info:
Heritage Auctions
2801 W. Airport Freeway
Dallas, TX 75261

Shipping, Taxes, Terms and Bidding
Charges to be determined based on Actual Shipping Costs incurred. Note: Additional invoice may follow original. Please contact us for more information. Sales Tax information

Important information concerning Sales Tax and Resale Certificates. Learn More

Terms and Conditions  |  Bidding Guidelines and Bid Increments |  Glossary of Terms

** Lots bearing estimates and without Consignor Reserve shall open at Heritage Auctions' discretion (usually 25% to 60% of the low estimate).

Starting Bid:
$600
Track Item