88 
THIRTEENTH REPORT. 
the Amherstburg quarry to the Sibley quarry as figured in the cut re- 
ferred to. This I have contended before and shall be able to set forth 
further evidence. The Dundee (Corniferous) limestone does not ex- 
tend westward to the Detroit river as thus figured, and does form the 
surface extension over the great part of the Amherstburg quarry in 
Anderdon, where the cut shows only Anderdon coral limestone out 
of relation. 
Analyzing Grabau’s faunal unit, this result is obtained: 
Flat Rock Dolomite: 
Stromatoporoidea, 0. 
Brachiopoda, 0. 
Pelecypoda, 0. 
Cephalopoda , 0. 
Annelida, 0. 
The Anderdon Limestone : 
Stromatoporoidea, G. 
Brachiopoda, 2. 
Pelecypoda, 1. 
Cephalopoda, 0. 
Annelida, 0 . 
Anthozoa , 3. 
Bryozoa, 0. 
Gastropoda, 0. 
Trilohitae, 0. 
Anthozoa, 12. 
Bryozoa, 0. 
Gastropoda , 2. 
Trilohitae, 6. 
The Amherstburg Bed 
Stro m atopo roi dea, 2 
Brachiopoda , 12. 
Pelecypoda , 3. 
Cephalopoda, 4. 
Annelida, 1. 
(dolomite) of Detroit River: 
Anthozoa, 13. 
Bryozoa, 1. 
Gastropoda, 8. 
Trilohitae, 1. 
Of the Stromatoporoidea 2 of G are in common between the Ander- 
don limestone and the Amherstburg dolomite. 
Of Anthozoa there is 1 in common throughout, and but 4 in common 
between the Anderdon limestone and the Amherstburg dolomite, out 
of a total of 21. 
Of Brachiopoda there is but 1 of 13 in common between the Anderdon 
limestone and the Amherstburg dolomite. 
Bryozoa is represented in the Amherstburg dolomite alone. 
Of Pelecypoda but 1 out of 3 is in common between the Anderdon and 
the Amherstburg. 
Of Gastropoda there is nothing in common, though 10 species have 
been noted. 
Cephalopoda, Trilohitae and Annelida are represented in the Amherst- 
burg only, in * Grabau’s list. T have since found Proetus crassimar- 
ginatus, in the Anderdon limestone. 
I submit that here is an internally exclusive “unit.” 
Nor is that the end of the comparison. Of 23 species (5 genera) identi- 
fied in the Anderdon limestone and the coral bed of the salt shaft at 
♦Michigan Geological and Biological Survey, 1909, The Monroe Formation, Graban and Sherzer. 
