REPORT OF NEW JERSEY STATE MUSEUM. 39 
The arrangement in these cases was similar to that of the 
previous ones. A small map showed the distribution of the 
Paleozoic rocks, and another the narrow bands of Portland- 
cement rock. Specimens of sandstone, shale and limestone 
illustrated the rock types, while other specimens showed the 
various stages in the manufacture and testing of Portland 
Cement. The unique forms of many of the fossils and their 
importance to the geologist were shown by specimens and 
drawings. 
The cases containing material from the Triassic or Red 
sandstone formation were arranged on the same plan as the 
others. Samples of shale, sandstone and trap represented 
the rock types. A large number of beautiful mineral speci¬ 
mens occur in the trap, and these were well shown. The 
principal economic products are “ brown stone ” for building, 
crushed trap rock for concrete and road material, and native 
copper. The chief fossil. remains are the footprints of the 
huge reptiles which walked the mud-flats, and the fish, which 
swam the shallow waters of those days, and representatives 
of these were here included. Maps showed the distribution 
of the sandstone and of the trap rock, and photographs made 
plain the column arstructure of the trap and the way the latter 
rested upon the gently inclined beds of shale and sandstone. 
The Cretaceous rocks of New Jersey are sands, clays and 
greensand marl or glauconite, numerous samples of each of 
which were shown. Inasmuch as the clays and greensand 
marls are the only products of economic importance, consid¬ 
erable emphassis was placed upon their proper representation. 
Here, as before, maps, brief descriptions, mineral specimens 
and fossils make the exhibit a completed unit. 
For the Tertiary and Pleistocene ages a similar arrangement 
of materials was adopted, but details are unnecessary. Enough 
has been said to show that in arranging the display of rocks, 
minerals, ores and fossils representative of the State, the effort 
was made to group these in their natural ralations and to sup¬ 
plement the specimens themselves by the necessary maps, 
labels and photographs to make the whole intelligible. 
Since the building stones of the State are widely distributed 
geologically, it seemed best to group the samples of these in 
