624 FAUNAL SUCCESSION OF THE UPPER BERNICIAN 



Notes. — The coral fauna, although presenting standard 

 conditions of deposition, nevertheless includes one or two 

 representatives of the Zaphrentid phase, e.g., Zaphrentis 

 consfrtcfa,*' which occurs in the shalef above the limestone at 

 Newton-on-the-Moor, together with Palceacis. 



For notes on the Clisiophyllids see page 632. 



The corals are most abundant in the lower and massive 

 portion of the limestone. At Lowick and Scremerston the 

 corals are not only remarkable for their great numbers, 

 but also on account of their excellent state of preservation. 

 Alveolites septosa and var. depressa occur as thin sinuous 

 bands often coalesced into masses. At Chollerford the base 

 of the limestone is almost entirely formed of Alveolites. 



Actlnocerata frequently attain a great length. Specimens 

 twelve feet long are by no means rare. 



At White Houses a thin bed of sandstone four feet in 

 thickness, intercalated in the shale a few feet above the 

 Great Limestone, is full of Productus latissiimts and bisulcate 

 Spirifers. 



The Little Limestone. 



Geographical Distribution. 



On entering the county from the west this bed runs along 

 the Tyne valley till approaching Watling Street, when it 

 changes its eastern course for a northern one. It turns 

 slightly to the east again beyond Scots Gap and runs N.N.E. 

 to within a mile of Brinkburn. North of this point it has not 

 been mapped, though borings prove its presence. In tlie 

 neighbourhood of Fallowfield several faulted outcrops occur. 

 Stratigraphical Character. 



Fairly compact bed, but the upper portion is rather 

 argillaceous in places. 



Faunal Character. 



No distinctive forms have yet been collected, the faunal 



* A. Vaug-han. 



t I have been informed by Prof. Lebour that in a plantation near Hartington 

 this phale was exposed as tlae bank of a bum and was fuU of small Chonetes, 



