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Sea Urchin Fossil

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INFORMATION
TIME SCALE
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PRODUCT INFORMATION

Fossilized sea urchin tests. All are about ¾ – 1" in diameter.

Species: Goniopygus
Era: Cretaceous (70 million years ago)

The pictures are average representatives of our current inventory. You may not receive the ones pictured, but specimens like them. We attempt to prioritize the largest specimens to ship first.

 

More info:

Sea urchins appear to have first evolved about 450 million years ago during the Ordovician period. We know this thanks to their calcium carbonate shells, called tests, which are exceptionally well preserved through fossilization. This urchin likely belonged to the genus Goniopygus which places this specimen in the late Cretaceous period, which occured 70 million years ago.

Urchin larvae have bilateral symmetry (two halves of their tests look like mirror images), but they develop five-fold symmetry as they mature. You may be able to make out the five symmetrical sections of your fossil. The larger hole in the test would have been the urchin’s mouth, and it would have pointed down.

TIME SCALE

This table contains the geological time periods of the past 2.5 billion years on Earth to aid in understanding age immense age of these fossils.

(Ma = Mega-annum = 1,000,000 years)
EON ERA PERIOD EXTENT (Ma) DURATION (Ma)
Phanerozoic Cenozoic Quaternary 2.588–Present 2.588+
Neogene 23.03–2.588 20.4
Paleogene 66.0–23.03 42.9
Mesozoic Cretaceous 145.5–66.0 79.5
Jurassic 201.3–145.0 56.3
Triassic 252.17–201.3 50.9
Paleozoic Permian 298.9–252.17 46.7
Carboniferous 358.9–298.9 60
Devonian 419.2–358.9 60.3
Silurian 443.4–419.2 24.2
Ordovician 485.4–443.4 42
Cambrian 541.0–485.4 55.6
Proterozoic Neoproterozoic Ediacaran 635.0–541.0 94
Cryogenian 850–635 215
Tonian 1,000–850 150
Mesoproterozoic Stenian 1,200–1,000 200
Ectasian 1,400–1,200 200
Calymmian 1,600–1,400 200
Paleoproterozoic Statherian 1,800–1,600 200
Orosirian 2,050–1,800 250
Rhyacian 2,300–2,050 250
Siderian 2,500–2,300 200
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Sea Urchin Fossil
Sea Urchin Fossil

Sea Urchin Fossil

$4.00$2.00
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