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Nummulite-like Eocene fossil limestone has not been documented in Quebec's geologic record, despite the province hosting world-class Ordovician fossils and sedimentary sequences. Quebec's Eocene geology, if present, has not been characterized in published literature as containing nummulitic deposits.

Nummulites commonly vary

in diameter from 13 to 50 mm and are common in Eocene to Miocene marine rocks, particularly around southwest Asia and the Mediterranean in the area that once constituted the Tethys Ocean—paleoenvironments fundamentally distinct from Quebec's documented Paleozoic and Ordovician stratigraphy.

Are there any Eocene geological formations exposed in Quebec?

Formation/DepositAge & SettingFossils PresentEnvironmentAnticosti IslandOrdovician–Silurian (447–437 Ma)Exceptional marine fauna, trilobites, brachiopodsMarine — shallow seasNeuville FormationOrdovician (~450 Ma)Soft-bodied cnidarians (Paleocanna tentaculum), trilobitesMarine — shallow seasNicolet River FormationOrdovician (Lorraine Group)Trilobites, calymenids, isotelus, lingulaMarine — shallow seasQuebec City area limestoneOrdovician–SilurianTrenton limestone, marine invertebratesMarine — platformEocene deposits in QuebecEocene (55.8–33.9 Ma)Not documented in sourcesUnknown

🦪 Quebec's Ordovician Fossil Record

Quebec hosts some of the world's most important Ordovician and Silurian fossil deposits, but these predate the Eocene Epoch by over 400 million years.

Anticosti Island

contains the largest stratigraphic record in thickness and the most complete and best-preserved paleontological record representing the first mass extinction of animal life on a global scale, spanning 447–437 million years ago—far older than Eocene nummulitic limestone.

• Anticosti UNESCO site —

  best natural laboratory

  in the world for studying fossils and sedimentary strata from the end of the Ordovician period, with exceptional abundance, diversity, and preservation of marine life

• Neuville Formation cnidarians —

  Paleocanna tentaculum

  , a tube-dwelling jellyfish relative discovered 50 km northeast of Quebec City, preserves rare soft-bodied organisms in shaly limestone beds from 450 million years ago

• Nicolet River trilobites —

  trilobites were quite common

  in the Lorraine Group, including calymenids, isotelus species, and associated fragments recovered from St. Lawrence River exposures in Montreal

🌍 Why Nummulites Cannot Occur in Quebec

Nummulites are marine foraminiferans with a restricted biogeographic and temporal range fundamentally incompatible with Quebec's documented geologic record.

Nummulites were particularly prominent

during the Eocene Epoch (55.8 million to 33.9 million years ago), and limestone of this age that occurs in the Sahara is called nummulite limestone in reference to the great abundance of its contained fossil nummulites.

• Temporal mismatch — Quebec's fossiliferous rocks span Ordovician–Silurian time (447–437 Ma); nummulites did not appear until the Late Cretaceous and became abundant only during Paleogene–Neogene time (65.5–2.6 Ma)

• Paleoenvironmental absence —

  particularly prominent during the Eocene Epoch

  in North Africa and the Mediterranean; no Tethyan seaway penetrated eastern North America or Quebec during the Eocene

• Geographic restriction — Quebec lay on the North American craton, far from the shallow marine shelf and platform environments where nummulites thrived in circum-Tethyan regions

📚 Quebec's Paleontological Heritage & Resources

Quebec's exceptional fossil record reflects Paleozoic marine environments and Quaternary deposits—representing an ancient tropical ocean and ice-age fauna utterly distinct from Eocene depositional settings. The

Canadian Museum of Nature

houses over 140,000 specimens, with nearly 90% from Canadian sites, spanning from 2 billion years ago to around 3,000 years ago.

• Anticosti Island research — World-renowned site attracting prominent Canadian and international researchers; studying this period enables understanding of profound climate changes the planet underwent during the Ordovician–Silurian interval

• Museum collections —

  Palaeobiology Collections

  include vertebrate and invertebrate fossils representing nearly 2 billion years of geologic history, with expanded holdings from Geological Survey of Canada transfers (continuing until 2027)

• Quebec City geology —

  Ordovician–Silurian stratigraphy

  dominated by Trenton limestone and Utica shale, with para-autochthonous and allochthonous Appalachian domain sequences, providing detailed record of ancient platform deposition

Nummulite limestone is restricted to Paleogene and Neogene periods in North Africa, the Mediterranean, and southwest Asia—making Quebec's ancient Paleozoic and Ordovician geology fundamentally incompatible with nummulite fossil occurrence.