Contact-alteration at New Galloway. 197 



the Upper Lias, has yielded Ammonites of the genus Bumortieria 

 to the author, notably D. radians. This blue clay is helow the 

 Yeovil Sands ; but the position of D. radians in the Cotteswolds is 

 in the limestone above the Cotteswold Sands, which has been placed 

 in the Inferior-Oolite series. 



The author, by combining the Down-Cliffs and Chideock-Hill 

 sections, obtains a sequence of beds from the Middle Lias to the top 

 beds of the Inferior Oolite, including the zones of sjpinatum, commune 

 and falciferum, jurense, opalinum, Murchisonce, concavum, and Par- 

 Tcinsoni. 



The genus Dumortieria binds the opalinum- and jurense-zones 

 together ; while at Symondsbury Hill the author has found Ludwigia 

 Murchisonw and Lioceras opalinum in the same bed, which renders 

 it difficult to draw a line of demarcation between Lias and Oolite 

 at the top of the opalinum-zone. 



The facts adduced in the paper furnish additional evidence of the 

 unreliability of a grouping which depends upon lithological appear- 

 ances, and it was because no satisfactory line could be drawn between 

 Lias and Oolite that the author, in a previous paper, supported the 

 continental plan of grouping Upper Lias and part of the Inferior 

 Oolite under the term Toarcian upon palaeontological grounds. In 

 the present paper he furnishes further statements in support of this 

 view. 



2. "On some new Mammals from the Red and Norwich Crags." 

 By E. T. Newton, Esq., F.G.S. 



3. " On Burrows and Tracks of Invertebrate Animals in Palaeozoic 

 Rocks, and other Markings." By Sir J. William Dawson, LL.D., 

 F.R.S., E.G.S. 



4. " Contact-alteration at New Galloway." By Miss M. I. 

 Gardiner. 



A description is given of an alternating series of grits and shales 

 occurring at the eastern end of the northern edge of the Cairn smore 

 of Fleet granite-mass. The rocks here are generally more altered 

 than around other parts of the granite margin. The author describes 

 a transverse section about half a mile from the granite, and traces 

 the changes which occur in the rocks when passing towards the 

 granite. She notices (1) the extreme variation in the amount of 

 alteration in different places, but at the same distance from the 

 granite ; (2) the entire recrystallization, in one locality, of the 

 shales for about 2 feet and of the grits for about 100 yards from the 

 granite margin ; (3) that material seems to have travelled through 

 the rock, so that the most altered grit largely consists of crystals, 

 here of one mineral, there of another, as though material had been 

 conveyed from one part of the rock to another to form small 

 nests ; (4) the apparent order of succession of the minerals, garnets 

 rarely containing anything but colouring-matter and quartz, chiasto- 

 lite containing garnets, and bands of mica sweeping round both; 

 (5) evidence which appears to the author to indicate dynamic meta- 

 morphism, as furnished by the sigmoidal folding of knots in the 



