8 Rev. R. Ashington-Bullen—Holian Deposits at Etel. 
formerly very extensive, judging by the vast number of derived 
pebbles of the same materials to be found on the present beach at Etel 
and elsewhere, and on the exposed point near the barre on the left 
bank of the river. 
OS el hefowenviet Is 
ee 
oe a a a 
= 3 
fo) °o se) co) ro) 
ro) (o) ° @) 2) oO ° ° ° Oo 
jen made ie 
Kough : leading upto Town 
I” road along Jalaise and down to shore. 
nled with masonry 
Fic. 2. Raised beach quarried away on east side of road. 
1. Granulite: about 2 ft. 6in. in deepest exposure. 
2. Raised beach: resting directly on the solid rock, 2 ft. 3in. to 2 ft. 6 in. 
3. ‘Head’: with occasional subangular granulite in its upper part and scattered 
pebbles in its lower, 3 ft. 6 in. to 4 feet, mould dark-brown peaty colour. 
§ 38. The underlying rock of the place is ‘ granulite’ (using the 
term in its French sense). ‘‘ La granulite forme trois trainées 
principales, toutes dirigées a 104° et par suites paralléles entre elles. 
La premicre (trainée de Locronan), trés étendue sur les feuilles 
voisines, ne forme que le coin N.E. de la fenille; la seconde (trainée 
de Rosporden) s’étend de Trévoux a Inzinzac; la troisiéme (trainée de 
Port-Louis) s’étend des [les Glenan a Etel .. . la granulite de la 
diéme trainée est plus franche (de la structure feuilletée) plus massive 
et a plus gros grains, dans les falaises des Glenans, de Ploemeur, de 
Port-Louis et de Gavre; sphéne, mica noir trés épigenisé en mica 
blanc, mica blanc, oligoclase, orthose, microcline, quartz.”’! Grains of 
mica are plentiful in the present beach-sand and in the blown-sand of 
the dunes, thus showing that the blown-sand is derived from the 
present beach. i 
Between the fles Glenan, 60 kilometres to the west of Htel and 
the mainland, the trawl brings up large pebbles of granite and 
porphyry, which belong to the raised beaches of the region. But the 
rolled pebbles that are found in the gréves of Plouhinec (5 miles from 
Ktel westward) and behind the sand-dunes seem to have been derived 
from a different district from the pebbles of the Glenan area. 
_ According to the French survey the district between the Blavet and 
Htel Rivers bears traces of a vast and ancient estuary.” 
§ 4. Large masses of peat, some 14 to 2 feet across, and about 
3 inches thick, one rolled into a rounded peat ‘boulder’, occurred on 
the sea face of the coast, near the ‘ Chaudronnier’ or ‘ Pierre d’Htel’ 
(see Diagram 3), and these, derived from some submarine area, coupled 
1 Note explicative, Sheet 88, Carte Géologique détaillée de Bretagne. Note 
explicative, Sheet 89, Carte Géol. det. ‘‘ Cette granulite . . . continue de Port- 
Louis 4 la Rivicre d’Auray.’? Mr. F. H. Butler points out that the French 
‘granulite’ is equivalent to the fine-grained muscovite-biotite granite of English 
petrologists (vide Harker, Petrology for Students). 
* Tbid. 
