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Impressive large fossil-bearing concretion discovered in Connecticut.This natural rock formed hundreds of millions of years ago in a shallow marine environment and contains visible fossils including brachiopods, a small trilobite impression, a coiled gastropod shell, and additional small marine invertebrates.
These concretions form when mineral-rich sediment hardens around decaying organic matter on the sea floor, preserving it as a fossil mass. Based on the fossils and composition, this example likely dates to the Ordovician–Silurian Period (approximately 440 million years ago) — part of New England’s ancient seabed history.
Rock type: Calcareous mudstone / limestone concretion
Visible fossils: Trilobite, brachiopods, gastropod, possible bryozoans or crinoid fragments
Dimensions: roughly 9–10\" across × 6.5-7\" high
Weight: 31 pounds (heavy!)
Condition: As found; no cleaning or cutting beyond gentle brushing
Ideal for collectors, educators, or as a unique natural display piece
Due to weight, this item is Local Pickup Only (Connecticut area).
The buyer may arrange their own freight or courier service if preferred.
Item Specifics:Object Type:Fossil ConcretionTime Period:Paleozoic (Ordovician–Silurian)Type:Trilobite, Brachiopod, GastropodRegion of Origin:Northeastern U.S. (Connecticut area)Condition:As found, unprepared natural concretionMaterial:Calcareous mudstone / limestoneSize:Approx. 9–10\" across × 10\" tallWeight:31 lbs.Shipping:Local Pickup OnlyCondition Statement
Natural, unprepared specimen. Some fossils are partially exposed on the surface while others remain embedded. Normal age cracks, weathering, and surface variation consistent with natural formation. No restoration or modern repairs.
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Again, please send me your zip code and I will provide you with a more accurate shipping quote. Seems like sometimes inflates what buyers see as far as calculated shipping.
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