Dolmanites Trilobites Collection

Dolmanites Trilobite

• The Dolmanites (often spelled Dalmanites) are among the most iconic trilobites found in the fossil-rich strata of Middleport, New York, and the surrounding Niagara County region.

• If you're interested in these fossils, here's what you should know about them and the area:

• Middleport is situated along the Niagara Escarpment. The fossils here primarily date from the Silurian Period (roughly 420–430 million years ago), when the region was covered by a shallow, tropical sea.

• The Formation: Most trilobites are found in the Rochester Shale formation, renowned among paleontologists for preserving delicate fossils, including trilobites, crinoids, brachiopods, and bryozoans.

• Dalmanites limulurus is the species most commonly associated with the Rochester Shale.

• Appearance: They feature a shovel-shaped head (cephalon) and a pointed tail (pygidium), often with large, detailed eyes.

• Size: Usually ranging from 2 to 4 inches; larger specimens are occasionally found.

• Behavior: Likely bottom-dwellers (benthic), scavenging or hunting small organisms on the muddy seafloor of the ancient Silurian sea.

• If you wish to find these yourself, keep the following in mind:

• Private Property: Much of the land along the Niagara Escarpment is private. Always seek permission from landowners before searching or digging.

• The Rochester Shale: Look for weathered shale outcrops, where rain and frost cause it to split into thin, flat plates. Trilobites are often discovered "in the split"—by cracking open a layer of rock to reveal the fossil on the surface.

• Tools: Bring a rock hammer, chisel, and safety glasses. Since the shale is soft, heavy mining equipment isn't necessary; a small masonry hammer usually suffices.

• Preservation: The softness of the Rochester Shale makes fossils fragile. If you find a partial specimen, it's best to leave it in the matrix (the surrounding rock) rather than risk shattering it by trying to pry it out.

• For collectors or enthusiasts, two excellent resources in the region are:

• The Buffalo Museum of Science: They house an extensive collection of local Silurian fossils and showcase high-quality, professionally prepared Dalmanites specimens.

• The Buffalo Geological Society: An active group of amateur and professional fossil hunters that frequently organizes field trips to local sites, including quarries and shale exposures. They are a great resource for learning legal and safe collecting practices in Western New York.

Please be aware of the nature of fossils:

Being buried underground for millions of years under immense pressure can be tough. Usually, fossils do not emerge in perfect condition; many require restoration, and some are even altered by people to improve their appearance. In the United States, workers perform this work very professionally, carefully unearthing and preserving these natural treasures.