72 



Goderich — Northward from this point, rock exposures 



are infrequent on the shores of the lake, 



but near Goderich a good section is revealed in the valley 



of the Maitland river. In descending order the following 



beds are exposed : — 





Thickness. 





Feet. 



Metres. 



I . Soil and drift 



50 

 9-5 



30 

 i-3 



19-5 

 2-5 



2-8 



5-5 



15-2 

 2-89 



9-14 

 •40 



5-93 



•760 

 •861 



1-67 



Hamilton — 



2. Compact grey to drab limestone 



Onondaga — 



3. Massive grey to brown crystalline limestone, 

 with fossils 



4. Brown crystalline coralline limestone 



5. Grey to brown limestone with numerous fossils 



at bottom 



6. Grey crystalline limestone with pebbles of 

 Silurian rock and quartz grains, fossiliferous 



Silurian {Monroe) — ■ 



8. Fractured, buff limestone and dolomites 



9. Soft, mottled, yellowish, porous limestones and 



dolomites 





The Hamilton strata are not particularly rich in 

 fossils at this point, but a careful search reveals numerous 

 species, of which the following are the more important: — 



Corals 



Cystiphyllum vesiculosum, Goldfuss. 

 Heliophyllum halli, E. and H. 

 Zaphrentis prolifica, Billings. 



Hydrozoa 



Stromatoporella sp. 



Brachiopods 



Atrypa reticularis {Linnaeus.) 

 Chonetes deflectus, Hall. 



