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San Juan terranes- San Juan Thrust System. Decatur terrane- Jurassic to early Cretaceous-An ophiolite with a younger superimposed arc. Overlying clastic marine sequence. Imbricate Fault Zone- late Cretaceous-fault slices of many different rock types– most sheared and structurally complex.

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San Juan terranes- San Juan Thrust System


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san juan terranes san juan thrust system
San Juan terranes-San Juan Thrust System
  • Decatur terrane- Jurassic to early Cretaceous-An ophiolite with a younger superimposed arc. Overlying clastic marine sequence.
  • Imbricate Fault Zone- late Cretaceous-fault slices of many different rock types– most sheared and structurally complex
san juan terranes san juan thrust system2
San Juan terranes- San Juan Thrust System
  • Constitution Formation- Jurassic to early Cretaceous- clastic sequence of volcaniclastic sediments with some ribbon cherts, and pillow lavas
  • Garrison terrane- Permian to early Triassic– high pressure schist. Occurs as small fault slices along one of the thrust faults.
san juan terranes san juan thrust system3
San Juan terranes- San Juan Thrust System
  • Deadman Bay Terrane- Triassic to early Jurassic- ribbon cherts, pillow basalts, and limestones; Tethyan-fusulinid limstone.
  • Turtleback Terrane- Cambrian to early Permian- plutonic complex of tonalite and gabbro. Upper unit consists of volcanic-arc with some limestones– Fusulinids are non-Tethyan.
san juan terranes external units
San Juan terranes-External Units
  • Haro Terrane- late Triassic to early Cretaceous- marine sandstone, conglomerates, volcaniclastic sediments
  • Nanimo Group- late Cretaceous- marine and non-marine sandstones, conglomerates, and shale
san juan terranes post orogenic unit
San Juan terranes-Post Orogenic Unit
  • Chuckanut Formation- Eocene– nonmarine sandstone and conglomerate