68 Notes on ISections of Stonekenge Rocks. 



Station, present many points of resemblance to the Stonehenge 

 specimens.^ 



Grits and Sandstones. 



These do not seem to be in any way remarkable, and with the 

 exception of No. 61, could, I have no doubt, be matched amongst 

 the palaeozoic sediments of Devon and Cornwall.^ 



(No. 61 contains glauconite grains and foraminifera. It is quite 

 distinct from the others and probably formed a part of some green- 

 sand deposit. See Wilts Mag., xxi., 144.) 



Un-named Rocks. 

 These are of igneous origin, and of intermediate composition. 

 They are in a very unsatisfactory state as regards preservation. 



Summary. 

 From the foregoing remarks it appears that the ophitic diabases, 

 rhyolitic felsites, and calcareous chloritie schists belong to types of 

 rock which are undoubtedly represented in the West of England. 

 My knowledge of that district is not sufficient to enable me to point 

 to any one locality where all these rocks occur together; but if such 

 a locality can be found the rocks occurring in it should certainly be 

 compared most carefully with those from Stonehenge. 



* The specimen No. 70 is from a stump also discovered by Mr. H. Cunnington 

 in 1881 (S. 28 on map, vol. xxi.). This variety of rock had been frequently 

 found in and around Stonehenge, but it does not belong to any of the stones now 

 above ground, and was unknown as part of the structure till 1881. Mr. Teall 

 describes it as follows : — " A calcareous chloritie schist. The minerals are not 

 as a rule well developed, but carbonates, chlorite, and iron ores, including p3'rite, 

 maj' be recognised. The rock is probably a cleaved and decomposed basic tu£E, 

 but the forms of the original fragments cannot now be distinctly seen." 



2 The black quartz-grit is not the material of an}' stone now in situ, above the 

 surface, at Stonehenge, though many pieces have been found. The probability 

 that it does belong to the building is the greater from the fact that a good sized 

 fragment was found in Barrow 41, about a mile from Stonehenge, accompanied 

 by a specimen of the calcareous schist, which, at that time unknown, has since 

 been proved to be one of the original stones. So the exact locality of the black 

 grit will probably be some day found, by careful search. It would be curious if 

 it should prove to be on the dark side of the temple — furthest from the rising sun. 



No. 69 is a fine-grained grit or sandstone composed of angular grains of quartz 

 and some decomposed felspar ; chlorite and iron ores are also present, but only 

 in small quantity. It was found in a hole near 29 on map. 



