File:The Quarterly journal of the Geological Society of London (12960652134).jpg

610
J. E. MAER ON THE PEEDEVONIAN
1
CD
of what one would expect if the
colonies were portions of d5 ; for
the grits, being evidently depo-
sited in shallow water, should
be thickest where the shallow
water was most prevalent, and
not where deep water prevailed,
as shown by the lenticular
masses of fine mud &c. which
compose the colonies.
On physical grounds, also, it
is to be expected that the soft
beds of e 1 and d 5 would be
crushed and fractured when the
hard limestones of the beds
above (E e 2, F, G) are folded and
faulted in a remarkable manner.
Having described these gene-
ral objections to the colonies, I
shall now proceed to give a de-
tailed account of those colonies
which I have examined: first,
those on the N.W. side of the
basin, viz. the colonies at Motol
and Beranka, Colonic Cotta, Co-
lonic D'Archiac, the colony on
the road to Yohrada and the
one at Tachlovice ; secondly,
, those on the S.E. side, viz. the
colony at Branik, that at Hod-
kovicek, Colonie Krejci, and
Colonic Haidinger.
1. Colonies of Motol and Be-
Tanka. — The colony at Motol is
situated about four miles to the
west of Prague ; it consists of
a considerable mass of black
shales and limestone nodules,
with apparently intrusive dia-
bases. Its actual junction
with the surrounding beds
is not seen. The section,
fig. 6, is taken across this
colony, and shows the manner
in which I would explain the
phenomena. It will be ob-
served that there is a repetition
of the older beds to the north
of the colony. This indicates