142 REPORTS ON THE STATE OF SCIENCE.—1912. 
ConcLUSION. 
The discovery of fossils of the Olenellus fauna in the bedded green 
sandstones of Comley Brook is of interest in itself as proving the exist- 
ence of Lower Cambrian strata in situ on the south-west side of the 
Dairy Hill dome, while the occurrence of the specimen, provisionally 
referred to Walcott’s genus Wanneria, adds a new form to the Lower 
Cambrian fauna of Europe. 
The Breccia bed of Excavation No. 49 has a double interest. It 
affords new and confirmatory evidence of the break between the Lower 
and the Middle Cambrian of the Comley area, and the fauna of the 
matrix contains forms identical with certain Middle Cambrian species 
from Scandinavia and South Wales. 
The whole story of the Cambrian rocks of Comley in so far as these 
rocks and their fossils are disclosed by the excavations carried out for 
the Committee cannot yet be written, but it may be of interest to 
note the principal results as they have appeared in my annual reports 
since 1908 :— 
1. Excavations of 1907, reported to the Dublin Meeting of 1908. 
Discovery of a Protoleius fauna immediately above the fauna of the 
Olenellus-Limestone. 
Fixation of the local stratigraphical line of division between the 
Lower and the Middle Cambrian. 
2. Lxcavations of 1908, reported to the Winnipeg Meeting of 1909. 
Discovery of a higher Middle Cambrian fauna containing Para- 
doxides Davidis (Salter) succeeded above by shales with Orthis (Orusia) 
lenticularis (Wahlenberg), in the northern part of the area, near the 
Shoot Rough Road. 
3. Hacavalions of 1909, reported to the Sheffield Meeting of 1910. 
Additions to the Paradoxides Davidis fauna (Billingsella, P. rugu- 
losus, &c.). 
Discovery of Lower Cambrian fossils in the southern part of the 
area near Robin’s Tump, and of the exhibition there of the unconformity 
between the Middle and Lower Cambrian. 
Publication of a diagram, showing the inter-relations of the Cambrian 
strata of Comley as far as then known. 
4. Excavations of 1910, reported to the Portsmouth Meeting of 1911. 
Additional and confirmatory evidence of the unconformity at Robin’s 
Tump. 
Discovery of O. lenticularis shale to the south of the spot. 
5. Hacavations of 1911, the subject of the present Report. 
Discovery of bedded green sandstone of Lower Cambrian age in 
Comley Brook, affording fossils characteristic of the Olenellus-Lime- 
stone of the Comley Quarry. 
