Dalmanites limulurus Trilobite Fossil – Lower Silurian | Rochester Shale, Middleport, New York, USA

A classic fossil trilobite, Dalmanites limulurus, from the lower Silurian Rochester Shale at Caleb's Quarry, Middleport, New York, USA. This specimen dates to approximately 425 million years ago, from one of the most historically significant and celebrated trilobite localities in North America.

Dalmanites limulurus is among the most iconic of all Silurian trilobites, instantly recognisable by its distinctive schizochroal eyes, pointed pygidium (tail spine), and beautifully sculpted carapace. The Rochester Shale of western New York has been producing exceptional trilobite specimens for over 150 years and remains a benchmark locality for collectors and palaeontologists worldwide.

Caleb's Quarry at Middleport is particularly renowned for yielding well-preserved, three-dimensionally intact specimens — a product of the fine-grained shale depositional environment of the ancient Silurian sea. Material from this specific locality is highly regarded and increasingly difficult to source.

A cornerstone specimen for any serious trilobite or Palaeozoic fossil collection.

• Species: Dalmanites limulurus
• Age: Lower Silurian (~425 million years old)
• Formation: Rochester Shale
• Locality: Caleb's Quarry, Middleport, New York, USA
• Condition: Fossil, natural preservation