Some Jurassic Rocks
Whitby Formation - fossiliferous concretion with Dactylioceras ammonite (Toarcian Stage, upper Lower Jurassic) from the Yorkshire coast, England.
Conway Granite, White Mountain Plutonic Series - porphyritic granite from the Jurassic near Meriden Hill, New Hampshire, USA.
Jericho Kimberlite - kimberlite (mid-Middle Jurassic, ~172 Ma) from Echo Bay, Canadian Arctic.
Sodic-calcic altered porphyritic granite from the Middle Jurassic (~169 Ma) at Mickey Pass, Singatse Range, Nevada, USA.
Arapien Formation - rock gypsum (gyprock) from the Middle Jurassic in the San Pitch Formation, Utah, USA.
White Limestone Formation - fossiliferous packstone with “Solenopora” jurassica fossil calcareous red algae (Bathonian Stage, upper Middle Jurassic, ~165-168 Ma) from Foss Cross Quarry, Cotswold Hills, England.
Picton Kimberlite Dike - kimberlite from the Middle Jurassic of Picton Quarry, Ontario, Canada.
Twist Gulch Formation - halite salt casts in friable mudshale from the Middle Jurassic of Salina Canyon, Utah, USA.
Koidu Kimberlite Complex - Jurassic kimberlite from the Yengema-Koidu area, Sierra Leone.
Josephine Peridotite (Josephine Ophiolite) - josephinite from the Jurassic of southwestern Oregon, USA.
Franciscan Complex - Late Jurassic (~155-158 Ma) retrograde eclogite from Jenner, California, USA.
Rosso Ammonitico Formation - hematitic, stylolitized nodular limestone from the lower Upper Jurassic of Verona Province, Italian Alps.
Hpakan-Tawmaw Jade Tract - jadeitites (late Tithonian Stage, near-latest Jurassic, 147 Ma) from the Naga-Adaman Ophiolite in the Indo-Burma Range, northern Burma. More info.
Hpakan-Tawmaw Jade Tract - kosmochlor jade (“maw sit sit”) (late Tithonian Stage, near-latest Jurassic, 147 Ma) from the Naga-Adaman Ophiolite in the Indo-Burma Range, northern Burma. More info.