12 
MUSEUM BULLETIN NO. 21. 
nearest Pas is about 4 miles from town. In this and succeeding 
cuts to the northeast the dolomite is exposed in sections 2 to 5 
feet thick. The rock is a light grey to lemon yellow coloured 
dolomite, lying in horizontal beds. The dolomite is generally a 
hard vesicular rock in which the moulds of salt crystals are oc- 
casionally seen. Fossils are generally scarce and at some locali- 
ties none were found. The exposures in a cut about 23 miles 
northeast of Pas, in connexion with the natural outcrops on the 
east rim of the lake a mile northwest of the cut, give a vertical 
section of about 40 feet of grey to buff dolomites. Fossils were 
collected from the very refractory dolomite exposed along the 
railway at this point. A stromatoporoid coral and in certain 
strata ostracods are abundant at this locality. Other fossils 
are scarce and poorly preserved. The following list indicates 
the character of the fauna as represented here. 
Str&matopora cf, concenirica Hall. 
Favosites cf. niagarensis Hall. 
Stropheodonta sp. 
Orthotheies sp. 
Camarotoechia cf. winiskensis Whiteaves. 
Pterinea cf. ocddmtalis Whiteaves. 
Diaphrostoma sp. 
Holopea sp. 
Murchisonia? sp. 
Orthoceras sp. 
Gompkoceras sp. 
Cyrtoceras sp. 
Leperditia cf. hisingeri Jones. 
The fragmentary character of most of the fossils represented 
in the above list discourages close comparison with the other 
faunas obtained from this region. The fauna is believed to repre- 
sent a horizon in the lower part of the Silurian. 
