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.
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.