e 
RAYMOND: CORRELATION OF THE ORDOVICIAN STRATA. 235 
Stose from thin-bedded dark limestone at the Mattheson limestone 
quarry near Abingdon, Virginia, I found numerous specimens of a 
Robergia very like R. micropthalma and a Telephus like 7. bicuspis. 
These trilobites were associated with diplograptid graptolites which 
Dr. Ulrich assures me are of typical Normanskill species. Such an 
association is found in the Climacograptus putillus zone of the Lower 
Dicellograptus shale at Anderson, Jemtland, Sweden, and the asso- 
ciation is too remarkable a coincidence to indicate anything other 
than approximate contemporaneity of the two formations. Stose 
gives the following section at Abingdon. 
Sevier shale — Eden fossils in upper and Trenton fossils in Feet. 
lower part. S00 
Moccasin limestone. Red limestone with few fossils. . 400 
Ottosee limestone, with Echinosphaerites. 200 
Athens shale. Calcareous shale and dark blue shaly lime- 
stone above; dark gray fissile shale below. 
The fauna mentioned was found in lower 
part. 500-600 
Stones River limestone. 400 
Knox dolomite (of Beekmantown age). 
From this section it may be seen that the Normanskill is younger 
than some part of the Stones River, and considerably older than the 
Sevier shale, the lower part of which seems to be of Trenton age, 
though to what part of the Trenton it appertains is not yet evident. 
The other section containing the Normanskill fauna was described 
by Powell (105) and is near Salem, Virginia. He records the following, 
in descending order: — 
Medina sandstone (Silurian). Feet. 
8. Shale, very fossiliferous. No list of fossils. 1200 
7. Blue to black shale and limestone. | 300 
6. Red and gray sandstone without fossils. 400 
5. Blue and black limestone without fossils. 500 
4. Black carbonaceous shale with numerous graptolites. 32 
species are listed, including Nemagraptus gracilis, Clima- 
cograptus putillus and Dicellograptus sextans. Triarthrus 
and Trinucleus are also recorded. 560 
3. Coarse grained dark limestone with bands of marble. 250 
2. Pure “dove” colored limestone with a Tetradium and 
large gastropods. 50 
1. Cherty magnesian limestone with Maclurites. 500 
