18 THE VICTORIAN NATURALIST. 



mark it stands up as a great wall 6 or 8 feet in height, and 

 averages something over 2 feet in thickness. Its course is 

 generally in a south-westerly direction, but is distinctly sinuous. 

 This dykestone, on examination, yielded many good examples 

 of included minerals, amongst which may be noted Hornblende, 

 Oligoclase, Biotite, and Apatite, and, of subsequently developed 

 species, Calcite and Gmelinite may be mentioned, together with 

 a very fair development of Limonite casing in parts. Another 

 fairly large dyke in this neighbourhood runs nearly at right angles 

 to that above mentioned — that is, approximately, in a south- 

 easterly direction — and is about 3 feet in width. This dyke also 

 contains similar occurrences of the above minerals, but much 

 larger included fragments can be obtained from it. We next 

 visited a section between 3 and 4 miles along the coast towards 

 Cape Schanck, which is an old and favoured hunting ground for 

 many of the zeolites. We were very fortunate in being able to 

 work out some very fine examples of Natrolite, Analcite, and 

 Gmelinite, also Calcite, Aragonite, Magnesite, and Dolomite. 



There are distinct basaltic and ash layers at this locality, and 

 both have been subjected to considerable decomposition, hence 

 the particular vugh-bearing layers of basalt richest in zeolites are 

 fairly easily worked by the enthusiastic mineralogist ; but as some 

 of the best ledges can only be reached from the shore at low tide 

 the spot is one that might frequently be found to be disappoint- 

 ing, and at the same time due caution has to be exerted to avoid 

 risk from some of the occasional gigantic breakers that thunder in 

 on this rugged coast. From a scenic point of view there are many 

 lovely aspects of this rough coast to be seen, as may be appreciated 

 to some slight extent from the photographs submitted. 



Geologically there are many points in the weathering of the 

 rocks and the striking evidences of marine erosion that are of 

 absorbing interest, but any detail of these features would perhaps 

 be out of place in the present notes. 



Although time did not permit us to go any further along the 

 coast on this occasion, it might be noted that some good spots 

 are sometimes accessible further along towards Cape Schanck. 

 From one of these, about three miles on the Flinders side of 

 the lighthouse, I have collected some very good examples of 

 Chabazite, Calcite, Aragonite, and a variety of the latter mineral 

 containing Strontium. 



I. Hornblende occurs in small and large sized included frag- 

 ments in a fine-grained dykestone, apparently basaltic, some of 

 the fragments measuring up to 2^/2 inches by 2 inches. It is of a 

 black colour, and has a highly-perfect prismatic cleavage, which 

 enables one to obtain very good oblique rhombic prisms of from 

 an inch and less to 2 inches in length, and up to three-quarters 

 of an inch along the macrodiagonal and about one-quarter of an 

 inch along the brachydiagonal. This mineral can also be 



