J. F. BLAKE ON THE UPPER 



Upper Portland. 

 P 4 . Cypris-beds, 2% metres. 



P 3 . Siliceous limestone with Cardium dissimile, 2^ m. 

 P 2 . Sands and grits with Natica elegans &c., 4 m. 

 P r Sands and calc-grits with Cardium Pellati, 3 m. 



Middle Portland. 

 2 . Clays and glauconitic limestones with Ostrea expansa, 13 m. 

 1 . Clays with Cardium morinicum, 15 m. 



Lower Portland. 

 Zone of Cyprina Brongniarti. 

 N r Sandstones with Pteroceras oceani 1 , q 

 N 3 . Sands with Natica Marcousana J m ' 

 jS" 2 . Conglomerate with Trigonia Pellati of Chatillon. 



Zone of Ammonites gigas. 

 N r Sands and grits with Amm. portlandicus, 7 m. 

 M„. Shales and upper calc-grits with Hemicidaris purbeckensis, 17 m. 



Upper Kjmmeridgian. 

 Zone of Ammonites erinus. 

 M r Shale and lower limestones with Amm. erinus, 12 m. 

 L. Sands and grits with Py gurus, 4|- m. 



Middle Kimmeridgian. 

 Zone of Ammonites caletanus. 

 K. Clays and upper limestones with Amm. caletanus, 18 m. 

 J. Sands and grits of Conincthun, 2 m. 



Lower Kjmmeridgian. 

 Zone of Ammonites orthoceras. 

 I. Clays and lower limestone with Amm. orthoceras, 22 m. 

 H. 13 beds and little beds of Brequereque, 15 m. 



Sequanian. 



G. Sands and grits of Wirvigne, 5 m. 

 F 3 . White marls and oolites of Bellebrune, 4 m. 

 F 2 . Clays with Ostrea deltoidea, 2 m. 

 F r Pisolite with large Nerincece of Hesdin-l'Abbe, 6 m. 



E. Red limestone, sands and grits, with Trigonia Bronnii, 5 m. 



D. Clays with 0. deltoidea of Brut dale and Mont des Boucards, 10 m. 



Cokallian. 



A r . Coral Rag with Cidaris fiorigemma of Brucdale. 

 C. Limestones with Tsocardia. ) Limestones of Mont des Bou- 

 B. Limestones with Terebratul®. I cards — Pyritous clays and hme- 

 A. Coral Rag with Cid. fiorigemma. J iXlis 50 m 



Upper Oxpordian. 

 Hovdlefort limestone with Pseudomelania heddinqtonensis, 1 m. 



Clays with Ammonites Martelli and sponges, H m. 



Middle Oxfordian. 

 Clays and limestones with Ostrea dilatata, 5 m. 

 Black clays of Wast, 6 m. 



Lower Oxfordian (Callovian). 

 Fissile limestones with Ammonites Lamberti, 2 m. 

 Clays with Ammonites Duncani, 6 m. 

 Ferruginous clays with Ammonites calloviensis, 5 m. 



