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.

 


 

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