68 Geological Society: — 
quartzite being conformably succeeded by the brown flags and 
dolomite. 
The " igneous rocks " of Nicol (" Logan Eock " of Dr. Heddle) 
were regarded as the old gneiss brought up by a fault and thrown 
over onto the Assynt group to the maximum breadth of more than 
a mile. 
The " Upper Limestone " of authors was described as either out- 
liers of the dolomite or a part of the Caledonian series. 
The Caledonian rocks were seen in Glen Coul to be immediately 
overlying the Hebridian, the Assynt group being caught in the 
angle between the two gneisses, and bent back in overthrown 
folds. 
The mountain-groups of Assynt were described as usually consist- 
ing of cores of Hebridian gneiss swathed in or capped by sheets 
of quartzite. In the former case the quartzite on the western 
slopes was contorted into overthrown folds by the thrust from the 
east. 
In the Loch-Eribol district, the "granulite" of Xicol was con- 
sidered to be a lower division of the Caledonian gneiss, though 
bearing some resemblances to the Hebridian. In other respects, 
the views of Xicol were regarded as substantially correct. Along 
the entire length of Loch Eribol, a distance of about twelve miles, 
the thrust from the east had bent back the Assynt group into over- 
thrown folds, and pushed the Caledonian gneiss onto the top of the 
inverted quartzite. This had produced the appearance of an 
" upper " quartzite passing " conformably " below the eastern 
gneiss. The superior antiquity of the Caledonian was confirmed by 
the occurrence of outliers of quartzite upon the Arnabol (Lower 
Caledonian) series, and by the fact that the granite, which sent 
numberless veins into the gneiss, never penetrated the quartzite and 
associated rocks. 
2. " On a Group of Minerals from Lilleshall, Salop." Bv C. J. 
Woodward, Esq., B.Sc, F.G.S. 
The minerals noticed in this paper occur in a bed of grey lime- 
stone in the Carboniferous Limestone at Lilleshall. They occur in 
vertical joints in the upper subdivisions of the bed. The following 
list gives them arranged in order of frequency, the least common 
being placed first : — quartz, bornite, towanite, iron-pyrites, hae- 
matite, barytes, calcite, dolomite (ankerite '?). Of the first, the 
author has only met with a single minute crystal. Iron-pyrites is 
by no means common ; haematite is more abundant. Analyses of two 
specimens of the " dolomite," show that one agrees very nearly with 
ankerite, while another, identical in aspect, exhibits considerable 
differences, being only a ferriferous dolomite. The author suggests 
that it is doubtful whether ankerite should be retained as a mineral 
species. 
3. " Fossil Chilostomatous Bryozoa from Muddv Creek, Victoria." 
By A. W. Waters, Esq., F.G.S. 
