) 
) 
4 
| 
Bia Dik rei rales Me ai  iidates Pr Shy rein a ig ot ea ens ee 
Progress of Geology. 5 
them. Rising in the scale of successive deposits, we find a cor- 
responding rise in the signs of former life on reaching that stage 
in the earlier — and schistose recks in which animal remains 
begin clearly to show themselves. ‘hus, the Primordial Zone 
of Mr. Barrande is, wae to = eminent man, the oldest 
fauna of his Silurian Basin in Bohemia.* 
In the classification adopted b Sir Henry De Ja Beche and 
his associates, the Lingula Flags (the equivalent of the “ Zone 
Primordial ” of Bar rrande) are similarly placed at the base of the 
Silurian System. This Primordial Zone is also classed as the 
west Silurian by De Verneuil, in Spain; by James Hall, Dale 
preen; and others, in the United States ; and by Sir W.E. Logan 
Sterry sats and Billings, in Canada + 
n the last year, Mr. ‘Barrande has most ably compared th 
North yeerd se "Taconic per of Emmonst with his own 
primordial Silurian fauna of Bohemia, and other parts of Europe; 
and although that sound paleontologist, Mr, James Hall, has not 
hitherto quite coincided with Mr. Barrande in some details, it is 
quite evident that the primordial fauna occurs in many parts o 
North America. And as the true order of succession has been 
ee we now know that the Taconic group is of the same 
as the lower Wisconsin beds described by Dale Owen, with 
shicir } Paradoxides, Dikelocephalus, &c., as well as of the ‘lower 
portion of the Quebec rocks, with their Conocephalus , Axionel- 
lus, &c.; described by Logan and Billings. Of the crystalline 
schists of Massachusetts, containing the noble specimen of Para- 
doxides described by W. B. Rogers, and of the Vermont beds, with 
their Oleni, it fullows that the Primordial Silurian Zone of Bar- 
* T learn, however, that in Bohemia Dr. Fritsch has recently discovered strata 
lying beneath the mass of the Primordial Zone of Barrande, and in rocks hitherto 
oe azoic, the fossil burrows of annelide animals similar to those of our own 
is own of Spain, in which has 
t in competing a aa val years. Sam in a heaiesing at of which he has di nln are 
he Silurian Sees was me in 1835, and in the wi 
eck 1836, Dr. Em ons suggested ets his nity shale rocks, which he ne le 
re were older than any I deseri 
2 tte are the writings of the Professors W. B. and H. D. Rogers in unison with 
the opinions of the authors here cited. 
