24 GEOLOGY. 



been found in the killas of Halamanning mines, situated 1^ mile from 

 any granitic outcrop. C. L. N. F. 



Jeffreys, J. G. ITote on the so-called Crag of Bridlington. JRep. 

 Brit. Assoc, for 1874, Sectio7is, pp. 83-87. 



Gives a list of 67 species of Mollusca, all high northern forms and 

 now liring. Suggests that this deposit might have originated in a 

 deviation of the great Arctic current at a remote period, or in glacial 

 conditions. It has no relation to the Norwich Crag. Certain littoral 

 shells formerly referred to the Bridlington Beds are rejected, as having 

 probably come from the Boulder Clay which overlies it. W. T. 



Jenkinson, H. I. Practical Guide to Carlisle, Gilsland, Roman Wall, 

 and Neighbourhood. 8vo. London. 



Geology, pp. 225-240. Mineralogy by B. M. "Wright, pp. 241-263, 

 with a descriptive list of the minerals of the district, and lists of Metal- 

 liferous Mines of the Gilsland District, situated at or around Alston 

 Moor, and of the Collieries. W. W. 



. Practical Guide to the English Lake District. Ed. 4. 8vo. 



London. (Ed. 3 m 1874.) 

 Geology, with Map, pp. xli-lxii. Mineralogy by B. M. Wright, pp. 

 Ixxi-xciii, with a List of the Minerals and Produce of the Mines. 



Jolly, W. Third Report of the Committee appointed for the purpose 

 of collecting Possils from localities of difficult access in North- 

 western Scotland. Bep. Brit. Assoc, for 1874, pp. 74, 75. 



No fresh collections have been made during the past year. 



Jones, Prof. T. R. Notes on some Sarsden Stones. Geol. Mag. dec. 

 2, vol. ii. pp. 588, 589. 



The Sarsden Stone which occurs in place in the Reading Beds at 

 Langley Park, near Newbury, is composed of quartz grains with a cal- 

 careous cement. In a Sarsden Stone of the Bagshot Series from gravel 

 at Frimley, Surrey, there are indications of vertical rootlets ; this may 

 explain the pittings which are seen on many weathered blocks of this 

 stone. W. T. 



Jones, Prof. T. R., andC. C. King. On some newly exposed Sec- 

 tions of the " Woolwich and Reading Beds " at Reading, Berks. 

 Quart. Journ. Geol. Soc. vol. xxxi. pp. 451-457, plate xxii. (sec- 

 tions). 

 Compare the section of the lowest Tertiary beds lately exposed at 

 Coley Hill with other sections in the neighbourhood. At one point 

 the leaf-bearing blue clays are absent, but are continued by thin irre- 

 gular seams of derived clay and clay-galls, with broken lignite, occa- 

 sional grey flints, &c. At another point, where the blue clay still exists, 

 large lumps of clay, rolled and often enclosing subangular flints, lie in 

 the sand over the leaf-bed. Some of these clay-galls have passed into 

 concentric nodules of ochre and limonite. The probable derivation of 

 the clay-gaUs is from pre-existing clay-beds (probably the blue shale) by 



