Phosphoria Formation, Permian geologic formation in western Idaho and Wyoming, United States.
The Phosphoria Formation extends across 350,000 square kilometers with layers of phosphorite, black shale, chert, and carbonate rocks reaching 420 meters in thickness.
During the Early Permian period, approximately 280 million years ago, marine sediments accumulated in a foreland basin between the continental margin and North American shelf.
The formation houses numerous fossil specimens, including brachiopods, crinoid stems, and the distinctive tooth whorls of the prehistoric shark Helicoprion.
Mining operations in the formation extract phosphate rock essential for agricultural fertilizer production, contributing to the regional agricultural industry.
The formation's source rocks generated over 225 billion barrels of oil, making it one of North America's most productive petroleum systems.
Location: Idaho
Location: Montana
Location: Nevada
Location: Utah
Location: Wyoming
GPS coordinates: 42.99570,-107.55120
Latest update: March 11, 2025 11:37
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