6o6 



FAUNAL SUCCESSION OF THE UPPER BERNICIAN 



Dielasma sacculus (Mart.) 

 Dielasma vesicularis (de Kon.) 

 Reticularia lineata (Mart.) 

 Lept?ena analoga (Phill.), var. 



distorta (Sow. ) 

 Giganteid Product!— Productus a 



and varieties. 

 Productus corrugatus, M'Coy. 

 Productus longispinus, Sow. 

 Productus punctatus (Mart.) 

 Productus spinulosus, Sow. 

 Pinna fiabelliformis, Mart. 

 Leveillia puzo, L'Eveille. 

 Naticopsis plicistria (Phill.) 

 Naticopsis variata (Phill.) 

 Platyschisma helicoides (J. de C. 

 Sow.) 



Faiinal List : — 



Dibunophylluni Q , Vaughan. 

 Dibunophyllum <^, Vaughan (Dl 



form.)* 

 Carcinophyllum Q , Vaughan. 

 Cyathophjdlum murchisoni, Ed. 



and H. 

 Diphyphyllum subibicinum (M'Coy) 

 Campophyllum murchisoni, Ed. 



and H.* 

 Clisiophylloid Lithostrotion. 

 Lithostrotion irregulare (Flem.) 

 Lithostrotion junceum ( Flcm. ) 

 Lithostrotion portlocki (Brom.)large 



and small varieties, also a Lons- 



daloid mutation. 

 Zaphrentis sp. 

 Alveolites. 

 Athyris royssii (L'Eveille.) 



Notes : — Lithostrotion junceum is not only most prolific in 

 its growth but it is exceptionally well developed. The coral- 

 lites are very long and very straight. 



I obtained most of the corals in the above list from two 

 small quarries at Birtley. Dibunophyllum cf> and Campo- 

 phyllum murchisoni (marked by an asterisk) were found in the 

 bed of a burn near Elsdon, and some doubt exists as to the 

 limestone from which tliey have been derived being the Redes- 

 dale Limestone. Both specimens are in Mr. Dunn's collection. 



Fourlaws Limestone. 



Stratigraphical Character. 



A dark-coloured compact limestone of at least lo feet in 

 thickness. 



Fatmal Diagnosis. 



Corals: — Not very plentiful. 



Brachiopods : — The Productids are represented by a large 

 number of species, including P. mesolobus and P. spimdosjis. 

 Productus a exceedingly abundant. Papilionaceous Chonetes 

 occur. 



