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 

 a great fault, which, as shown 



