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Huerfano County Geological

geological map

Quaternary, Tertiary and Late Cretaceous Igneous Rocks
symbolQuaternary: Less than 2 million years ago
symbolPliocene-Miocene: 2 to 24 million years ago
symbolOligocene: 24 to 37 million years ago
symbolUpper Tertiary: Less than 20 million years ago
symbolMiddle Tertiary: 20 to 40 million years ago
symbolLaramide: 40 to 72 million years ago
Sedimentary Rocks
symbolQuaternary-Tertiary: Less than 4 million years ago
symbolUpper Tertiary: 4 to 37 million years ago
symbolLower Tertiary: 37 to 72 million years ago
symbolUpper Cretaceous: 72 to 95 million years ago
symbolUpper Cretaceous: 95 to 115 million years ago
symbolLower Cretaceous: 115 to 144 million years ago
symbolJurassic: 144 to 208 million years ago
symbolTriassic: 208 to 245 million years ago
symbolPermian-Pennsylvanian: 245 to 320 million years ago
symbolMississippian, Devonian, Ordovician, Cambrian: 320 to 570 million years ago
Cambrian & Precambrian Igneous and Metamorphic Rocks
symbolCambrian: 510 to 570 million years ago
symbolPrecambrian: 950 to 1,400 million years ago
symbolPrecambrian: 1,700 to 1,800 million years ago
symbolGranitic: 1,000 to 1,400 million years ago
symbolGranitic: 1,700+ million years ago