160 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY, 
interesting, however, in showing that we have not yet arrived at 
a thoroughly satisfactory understanding of this important region. 
New Jersey Highlands. — The New Jersey Highlands consist 
of a complex of highly folded and faulted pre-('ambrian rocLs 
of l)oth igneous and sechmentary origin, with which are infolded 
narrow strips of Palaeozoic strata which are for the most part of 
Cambrian and Ordovician ages. The latter are themselves 
more or less metamorphosed. A tabulation of the succession of 
formations in this and in adjoining regions as given in the 
Trenton Folio (No. 167) is reproduced below. Most of the cor- 
relations made south of New England are based upon lithological 
similarity or continuity. In some cases fossils have been found, 
and they make the correlation more sure. 
Southwestern 
New England 
New YoTk 
Pennsylvania 
Maryland 
Trenton (N.J.) 
Quadrangle 
Ordovician 
Berkshire 8ch. 
Hudson sch. • 
Octoraro sch. 
Peach Bottom si. 
Cardiff queurtz eg. 
Mica sch. & phyll. 
Cambro- 
Ordovician 
Stockbridge Is. 
Stockbridge is. 
Shenandoah Is. 
Cockeysville mar. 
Shenandoah Is. 
Cambrian 
Cheshire qzte. 
Poughquagqzte. 
Chickies qzte. 
Setters qzte. 
Chickies qzte. 
Pre-Cambrian 
Stamford 
Becket, etc. 
Fordham gn. 
Wissahickon gn. 
Baltimore gn. 
Baltimore gn. 
Franklin Is. 
Wissahickon gn. 
Baltimore gn. 
A very good though brief summary of the essential points in 
the geology of New Jersey is a paper by Kiimmel, entitled 
Geological Section of New Jersey. In this paper Kiimmel 
describes the Cambrian rocks of New Jersey under the following 
formational names: Hardyston quartzite and Kittatinny lime- 
stone. To the Ordovician system belong the Jacksonburg 
limestones and the Martinsburg shale. The latter is consider- 
ably cleaved. With regard to the interval between the Ordovi- 
cian and the Silurian, he states that it is "unaccompanied in this 
region by folding." Between the Shawangunk conglomerate 
and the Martinsburg shale "there is no marked divergence of 
dip and strike where the two formations outcrop in proximity 
and the actual contact is nowhere exposed in New Jersey."^ In 
a short paragraph on the structure of the Palaeozoic rocks he 
'Ktimmel, H. B. Journ. GeoL. vo!. 17. p. 357. 1909. 
