Hamilton Quarry is a Late Carboniferous lagerstätte near Hamilton, Kansas, United States. It has a diverse assemblage of unusually well-preserved marine, euryhaline, freshwater, flying, and terrestrial fossils. The habitat of some of these faunal elements, as for anamniotic stegocephalians, is debated; although some of these have traditionally been interpreted as freshwater inhabitants, some may have been euryhaline. This extraordinary mix of fossils suggests it was once an estuary. This type of Lagerstätte is considered a Konservat-Lagerstätte, due to the quality the preservation of soft tissue.