HE CARBONIFEROUS OF CAPE BRETON—GILPIN. 295 

argillaceous and calcareous, and frequently carrying nodules of 
limestone and iron ore. Numerous beds of limestone are met, 
compact, laminated, or concretionary, usually gray and blue, 
sometimes black and bituminous. These are frequently asso- 
‘ciated with beds of gypsum and anhydrite, sometimes over 100 
feet in thickness. Beds of red and gray Sandstone, usually 
laminated, often micaceous and ripple-marked, are frequently 
met. The limestones generally carry the fossils characterising 
the formation, and are frequently charged with galena and copper 
pyrites, celestine, manganese ores, ete. 
The following section, taken trom the report of H. Fletcher, 
Esq., of the Geological Survey, for the years 1875-76, gives a 
good idea of the conditions under which the limestones and 
wypsum are usually presented :— 
ft. in. 
Bluish gray columnar limestone....... gent he 0 0 
Measures contealed)...c6. 2.0. cake et 50 0 
AEMEENIMAMD EN fc iss sscstit apa gig tls Ra ost 8 thet oe 9 0 
Black bituminous nodular, gray and mottled 
Compact iMMestOMe-. yo... 52 sa. iN 55 0) 
Gray compact and variegated limestone, with 
fossiisand layers: Ob Marl) 2. 4.25.04. 40 0 
White crumbling gypsum . Bese Mike cae rare 8, 0 
<reen! oy PSeUUS, MAT. 3. S26. ee rare gO 7 
Greenish gypseous marl, with streaks of pink 
ey psuml oe 2. Gad eg i een ava aan ae 1 6 
Red micaceous marl, with green blotches and 
thin wavey layers of gypsum ........ 7 0 
White gypsum in nedules witn marl ..... need 0 
Gypsum and marl, with veins of white and 
Pink say PSUR eet teens. Ss. pn ee os 1 6 
Nodular gypsum, with emerald green blotches 
and a pink layer....... Sn i ee tema 0 
Nodular gypsum, and red arenaceous marl, 
and blue thick-bedded limestone...... — — 
The gypsum varies greatly in appearance and quality, and the 
following description of an immense cliff of it on the Bras @’Or 
Lake will serve to show its characteristic features :-— 
