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Humboldt Park
The rocks found in Humboldt Park date from the late Silurian Period to the middle Devonian Period (about 425 million years ago). The region was covered by warm ocean. Sand, silt, and clay, carried by rivers, were deposited as thick layers of sediment. Marine organisms, like the eurypterids and trilobites, thrived in this tropical ocean and their remains accumulated along with the sediment. Over millions of years these materials became compressed into massive layers of sedimentary rocks we see today.
Stereoscopic view of Humboldt Park, ca. 1905
Image source: Buffalo Olmsted Parks Conservancy found in New York Heritage: https://nyheritage.contentdm.oclc.org/digital/collection/NYBFL/id/490/rec/11