Casts of Scolithus, etc. — Wanner. 35 
be settled if there existed in some part of Europe an anal- 
ogous deposit to our drift properly so called, or ancient drift, 
such as is found on the shores of lake Superior and in the 
plains of the West, and in which no one has as yet found any 
trace of fossils." 
I likewise find that professor J. D. Whitney in 1857® referred 
to the use of Laurentian by Logan and stated that this term 
had been adopted by "Mr. Desor and the geologists of the lake 
Superior survey for the post-tertiary deposits, containing 
marine fossils, which are found in the valley of the St. Law- 
rence and elsewhere, and which has been called "Second 
drift" by some geologists. The use of the same term to des- 
ignate a group or system at the other extremity of the geo- 
logical scale seems likely to lead to confusion, and we hope 
that it will be dropped for the lower system, and retained for 
the deposits to which it was at first applied." 
It appears that Whitney and Wadsworth^ regarded the 
Laurentian of Logan as a synonym for the Azoic of Foster 
and Whitney proposed in 1850, or four years previous to the 
publication of Logan's name. 
The paper of professor Whitney above alluded to was 
noticed by E. J. Chapman, the editor of the Canadian Jour- 
nal,'" in the following words : "With regard to the term 
Laurentian as applied to some of these Canadian rocks, 
we would observe, that even if the term were previously 
applied to patches of post-Tertiary strata alluded to above, its 
peculiar fitness for the gneissoid rocks of the Laurentian 
range and connected country would fully warrant its reten- 
tion." 
Washington, D. C, Dec. 6, 1889. 
CASTS OF SCOLITHUS FLATTENED BY PRESSURE. 
By Atreus Wanner, York, Penn. 
[Read at the Toronto meeting'A.A.A.S. 1SS9.] 
The Hellam Quartzite, in York county, Pa., is filled with 
Scolithus linearis. Chickis pck, of Lancaster county, Pa., in 
which Prof. Haldeman first found the fossil, is an extension 
'^ Am. Jour. Sci., 2nd ser. vol. 23, p. 314 ; "Remarks on the Huronian 
and Laurentian systems of the Canada Geological Survey." 
'•"'The Azoic system and its proposed subdivisions;" Mus. Comp. 
Zoology of Cambridge, Bull., vol. 7, p. 340, 1884. 
'"2nd series, vol. 2, p. 302, 1857. 
