Ammonite Fossils with Spiked Spines / 1.5-2.5" AVG - 1 KILO LOT Menu Skulls a 1-inch rough stone

a 1-inch rough stone

Pieces measure approximately 15-50mm

Average size range: 25 to 40 millimeters

Selenite Bowl measures approximately 3

Avg Size Range: (1 To 2 Inches) Sizes Vary

Ammonite Fossils with Spiked Spines / 1.5-2.5" AVG - 1 KILO LOT Menu Skulls a 1-inch rough stoneQuantity: 1 kilogram Average size range: 1. 5 to 2. 5 inches Ammonites were spiral shelled animals that lived hundreds of millions of years ago, and are most closely related to modern day octopi and cuttlefish than mollusks. The fossils for these species are so widespread that paleontologists and geologists use them as index fossils to determine when rock layers formed.