228 CATALOGUE OF THE LOCAL FOSSILS IN THE 



SECONDARY OR MESOZOIC PERIOD. 



Trias or New-red Sandstone. 



Visible in the scar off West Hartlepool, near Seaton Carew, Preston 

 Junction, and at Coatham Stobs, and proved to be of great thick- 

 ness in the recent borings for Salt in South Durham. 



PRIMARY OR PALAEOZOIC PERIOD. 



Permian. 



Magnesian-limestone and Marl-Slate resting on the Yellow-Sand or 

 on the denuded edges of the Coal-measures. 



Carboniferous. 



Coal-Measures, Gannister beds, Millstone-Grit, Yoredale-series, Scar- 

 limestone series, and Tuedian or Calciferous-sandstone series. 



Devonian. 



Old red conglomerates on the South-eastern flanks of the Cheviot 

 porphyry in Roddam Dene and elsewhere. 



Silurian. 



Small patches of Silurian shales on the Eastern flank of the Pennine 

 range and the Cheviots. 



TERTIARY. 



RECENT AND HISTORIC. 



The Fossils found in the Recent deposits are arranged in 

 the Geological Room, Side Cases No. 2, 3. 



The fossils of this period are accumulations of marine or fresh- 

 water shells deposited either in estuarine silts, as Scrolicularia 

 piper ata, or layers of Entomostraca or Lymnseas, etc., in old 

 Lake beds, intercalated among beds of brick clay. Remains of 

 the Red Deer, Roebuck, Elk, and Wild Boar dredged up with 

 river silt, or found in the newest cave deposits with bones of 

 man, as the Great Auk, Wolf, Northern Lynx, and other animals 

 now extinct in these counties. The bones thrown out in exca- 

 vations of Roman Camps, also include the Dog, Goat, Horse, etc. 

 See Trans. Tyneside K E. Club, Vol. V., p. Ill, and Nat. 

 Hist. Trans. K, D., and NC, Vol, VII., p. 361, et seq. 



