File:The Quarterly journal of the Geological Society of London (13205904324).jpg

24 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. .June 3,
moisture, as formerly pointed out by Linnaeus, when he spoke of the
Conchistriati and Entrochi of this locality. In the quarries of
Bursvik the best sandstones are separated from each other by thin
courses of shale, and though they here and there present casts of
shells, it is chiefly in the overlying or pisolitic bed that these occur ;
viz. Cypricardia retrojiexa^ C. reticulata^ Leptcena lata^ with a beau-
tiful Lucina, which seems to have escaped the vigilance of Hisinger,
and which we willingly dedicate to that persevering Swedish geolo-
gist, who is entitled to much commendation for his various works,
geological and palaeontological (^Lucina Hisingeri, Murch. and De
Vern.).
Lucina Hisingeri,
LuciNA? Hisingeri : a smooth lenticular shell, with the apex inclined rather forward and
slightly curved. It is a matter of regret that neither the inner surface^nor the hinge has been
seen, consequently the genus is doubtful.
Between Grotlingbo and Bursvik the sandstone and oolite are not
overlaid by any rock, and with the exception of a few large northern
blocks and some blown sand, which partially obscure the surface,
this barren and treeless district is characterized by its stone walls of
sandstone and its pisolitic oolite.
This external aspect might well indeed have led to a geological
mistake ; for anyone who did not examine the fossils and had not
learnt their position in the palaeozoic series by comparison with the
structure of other countries, might naturally have referred these
strata to the oolitic series. The coarser oolite or pisolite of South
Gothland is, in fact, scarcely distinguishable from the pea-grit of
the inferior oolite of Cheltenham, and the finer-grained rock is
mineralogically the same as numerous specimens of the middle and
upper oolites of Britain, or of the tertiary oolites of Styria.
This error was committed by Hisinger, in his general map of
Sweden*, and the same author having published a true Jurassic
or Lias Ammonite as pertaining to this district, the erroneous view
was for a time entertained by other European authors.
With respect to this Ammonite, we were informed by the best
authorities in Stockholm that it was not found in any stratum of ,.

• Hisinger's petrographical map of Gothland, on tlie contrary, conveys an
  

opposite view, viz. that the limestone is the same from north to south, and di-
rectly overlies the sandstone of Bmsvik and Grotlingbo. The latter was there-
fore considered by that author to be the fundamental rock of the island, instead