————SE—— 
ese, rer lc ”—~C~S 
= 
TRANSACTIONS OF SECTION C. 813 
reptile and other bones, bituminous coal, copper, silver, and iron ores, but there 
are no craters, lakes, or mineral springs. 
III. A band of gneiss, granite, slates, crystallised limestone, and iron ores of 
Archiean and Silurian ages, intersected by dykes and lodes carrying gold, silver, 
lead, &c. In these rocks are large caves in which human crania and other frac- 
tured bones of Neolithic or earlier date are found. There are cold and hot mineral 
springs but no volcanoes in this section. 
IV. A narrow strip adjoining the last, and quite similar to section II., 
except that the rocks have not been so much disturbed. This section contains 
several gold placer mines—the beds of large early quaternary period rivers—some of 
them rich in gold; for example, the old river bed near to and on the north side of 
the present epoch river Prince Apulca. 
Y. Azone 80 to 100 miles wide, adjoining the Caribbean Sea, consisting of 
lagoons, swamps, and deltas, with a raised bed of sand. Mounds occur in this 
section containing stone hatchets, flint arrow-heads and spear-heads, and bones of 
man older in date than the Spanish occupation. 
MONDAY, SEPTEMBER 8. 
The ‘following Papers and Reports were read :— 
L. Preliminary Note on the Composition and Origin of Cheshire Boulders. 
By J. Courts Antrosus, M.A., and Freverick H. Hatcu, Ph.D., F.G.S. 
During the past twenty years a great number of boulders have been col- 
lected by the first-named author within a two-mile radius of Eaton, near 
Congleton. A microscopic examination of thin sections made from specimens of 
these boulders has been productive of interesting results, and has given certain 
indications of the sources whence the ice-borne boulders have been derived. The 
specimens examined constitute a fair average of the boulders as they occur, with 
the exception perhaps that the sedimentary rocks have been somewhat neglected 
as compared with the igneous samples. Of 68 specimens examined, 38:2 per 
cent. were granites, microgranites, and granophyres; 41°2 per cent. were volcanic 
(lavas and tuffs); 13:2 per cent. were sedimentary (quartzites) ; while 7:4 per 
cent. remained undetermined. Of the granites, &c., 15:2 per cent. were assigned 
to the Lake District, four specimens being identified as Muncaster granite and five 
as Buttermere granophyre; the rest are derived from the South of Scotland, and 
possibly the Western Isles of Scotland.! Shap granite, so abundant in the more 
easterly counties, was not found in the district under examination. The volcanic 
rocks are represented by types of lava, breccia and tuff, familiar to the student of 
Lake District geology. ‘They belong to the Borrowdale Voleanic series, Hight 
specimens were found to be andesite; seven specimens rhyolite, and thirteen 
breccia or tuff. One specimen of gabbro and one of basalt are identical with those 
of the Western Isles of Scotland or of Antrim. The quartzites appear to be 
derived from the Ganister beds of the Carboniferous system. 
; 2. On some West-Yorkshire Mica-trap Dykes. 
By Freperick H. Haroun, Ph.D., F.G.S. 
These notes refer to the petrographical character of the mica-trap dykes which 
are so numerous in the neighbourhood of Sedbergh, where they occur traversing 
rocks chiefly belonging to the Coniston Limestone series. They are fairly compact 
rocks, usually varying in colour from almost black to light-grey, but occasionally 
they are of a reddish-brown, or even of a cream colour. Their most constant 
? Comparisons with the rocks from these districts have yet to be made, 
