J 'orkshire Xd/iwd/isls at Inglcton. 237 



efifervese with acids in the slightest degree.' This is an extract 

 trom 'Playfair's Illustrations of the Huttonian Theory,' p. 217, 

 1802, which had not been noticed by the writer previous to the 

 excursion, but now seems worthy of mention. A number of 

 fossils, mostly corals, were obtained from the lower part of the 

 limestone here, which, tog-ether with some from Skirvvith and 

 trom the other sections examined later, will be carefully 

 determined, and it is hoped they will furnish sufficient evidence 

 to co-relate the Basement Carboniferous rocks of this area with 

 those of the South Wales and Bristol areas. Should this be 

 done, the excursion will have answered a very useful purpose. 



Still further up the dale, on about the same line, the con- 

 glomerate was seen ag-ain, containing-, in its lower part, very 

 larg-e stones. The surface of the older rocks seems to be 

 uneven, the cong-lomerate filling- the larger hollows. 



The ' Granite ' Quarry was next visited. Here the two 

 parties joined, and were met by Mr. Tate, the manag-er, whose 

 willing^ly rendered local information was gfreatly appreciated. 

 The quarry showed a mag-nificent section, and formed the 

 puzzle of the day. The rock has been described variously as 

 g-rit, conglomerate, g-ranite, porphyry, syenitic g-ranite, and 

 arkose. Some have considered it as ig-neous, others as 

 detrital, and theie appears to be e\idence in favour of each. 

 A good arg^ument in favour of the former was a larg-e block of 

 the ' g-ranite ' with irregular and angular larg-e pieces of slate 

 included. The late Thos. Tate, in describing- a microscopic 

 examination of it,* says ' it consists of frag-ments of various 

 metamorphic, as well as of eruptive and pyroclastic rocks, 

 slates, chlorite, mica, and quartz schists ; peg'matite ; quartzose 

 arid granitoids ; tog-ether with ancient rhyolitic la\as, showing- 

 banded fluxion and spherulitic structures. Some of the latter 

 hold porphyrytically developed crystals of remarkably clear 

 sanidine, and of quartz enclosing portions of the felsitic g^round 

 mass All these various rock fragments are firmly bound 

 tog-ether by a cement of green diabasic paste, with very fresh 

 lath-shaped cr3-stals of plagioclase, and more basic minerals, 

 probably aug-ite and olivine, now converted into secondary 

 products such as chlorite and epidote. The fragfments are 

 little water-worn, so cannot have been carried far. Its deposit 

 formed an episode in the prevailing- volcanic conditions of the 

 period ; consequently we find it sandwiched between beds of 



* Trans. Leods Geol. Assoc, pi. 6. 

 1906 July 1. 



