Cambrian Rocks in Acadia. nar 
This lower series is lithologically very different from the 
St. John group, and in the eastern part of St. John county, 
and on the St. John R., exhibits a far more important series 
of beds than can be seen at the section in the city of St. 
John, where the Cambrian rocks were first studied. The 
older series has at its base a conglomerate, which rests in 
some places on the Coldbrook group, and in others on the 
Laurentian rocks. A good section may be observed at 
Hanford Brook, St. Martin’s, where it presents the following 
succession (roughly estimated) :— 
Estimated 
thickness 
in feet. 
Coarse, purplish red conglomerate, resting on an a myg- 
daloidal greenstone (toadstone) of the Coldbrook 
SED) DACA Og COCR ACO pO Mee eed A doco dedsogdocaba0ONO 60 
Grey flags and sandstones with worm casts (Scolites) and 
worm tracks (Helminthites). Alternations of grey 
and purplish red sandstones ....-. se+ese eeeeeevees 70 
Purplish, red sandstones, with greenish layers, remains 
of seaweeds (?) gritty, purplish red sandstones and 
flagstones, animal tracks Psammichnites and Helm- 
inthites, worm burrows (Arenicolites) and worm casts 
DOSE Ce reer eia ees ateyalo) cietecnicinta lets) via wirais,e slate) Slee! eicie. © Abo 240 
Purplish conglomerate (35 feet) soft, purplish red shales, 
with green (glauconite ?) grains, the upper part 
firmer and more sandy; greenish, greylayers in- 
terspersed, especially toward the base. Remains of 
seaweed (?) and a brachiopod ..--..-seeeseeeeeeee 210 
_ 5, Purplish, sandy shales, with a few bands of greenish 
shale. Worm casts (Scolites)....+. cccsccvers vereee 300 
6. Measures concealed, probably of this series....+.-+-++++ 320 
1,200 
In this important series of beds, the very oldest layers, 
which are fine enough to preserve organic markings, abound 
with the trails and casts of marine worms, and within one 
hundred feet of these, in ascending through the measures, 
we meet with branching organisms in fine shale, which 
have left a thin carbonaceous film upon the layers of the 
shale; these impressions appear to have been seaweeds, 
but they may have been organisms allied to the graptolites 
or the sponges. 
=s 
