552 
BULLETIN OF THE NATURAL HISTORY SOCIETY. 
EXPLANATION OF PLATE 
Fig. i. — Geological sketchmap of the vicinity of St. John, N. B., 
(from the map of the geological survey) showing where Archaeozoon 
has been found. 
Areas occupied by Pre-Cambrian schists and intrusives. (Marked by 
small crosses). 
Pre-Cambrian limestones, the large area is not continuous as represent- 
ed. (Marked by dots). 
Cambrian (and Lower Ordovician). (Marked by vertical lines). 
Little River plant-bearing terrane. (Marked by horizontal lines). 
Overlying red conglomerate and shales. (Marked by circles). 
Localities where Archaeozoon has been found. (Marked by large 
crosses. 
N. B. — the locality at Black River is outside of the limits of this map 
(to the S. E.). 
Fig. 2. — (The original figure of this form published in Bulletin IX, 
1880). It is a vertical section of Archaeozoon Acadiense, one-half diam. 
It shows well the alternating convex layers of a single column. From 
the Upper Series of the Laurentian area at Green Head, St. John Co., 
N. B. 
Fig. 3. — Horizontal section of this species, one-seventh diam. It shows 
the spaces between the columns filled with a magnesian deposit. After 
the hardening of the limestone mass it suffered somewhat from lateral 
squeezing and from faulting, and the columns were somewhat broken up. 
N. B. — The parallel striation on the surface of the rock is due to the 
saw. From Green Head, St. John Co.. N. B. 
Fig. 4. — Vertical section of a group of weathered columns of 
Archaeozoon Acadiense one-sixth diam. This shows the origination of 
a colony of Archaeozoon on horizontal layers of calcareous mud ; at first 
the growth was irregular and sporadic; then gradually developing distinct 
vertical columns, the margins of the columns are indicated by a pale gray 
coloring; in the upper, more weathered portion of the block, the convex 
layers of the fossil are more distinctly visible. From limestone of the 
southern basin of the Upper Series at Douglas Avenue, St. John, N. B. 
