40 hayden: geology of spiti. 
of limestone, occurring at about i88 feet above the quartzite (No. 5) ,; 
it has yielded the following forms : — 
Producfus co^-a, d'Orb, 
,, semireticulatus, Mart. 
Syringothyris cuspidata. Mart. 
Sptrifer, sp. 
Rhynchonella pleurodon, Phill. 
„ „ var. davreuxiana, de Kon. 
Athyris royssii, Lev. 
„ subtilita, Hall. 
Chonetes hardrensis, Phill. 
Strophomena analoga, Phill. 
Aviculopecten sp. 
Eupliemus urti, Fleming. 
Pleurotnmaria sp. 
Platyceras sp. 
Conulariaci. quadrisulcata. Miller. 
Chatetes radians, Fisch. 
It will be seen that the forms found at this horizon are to a great 
extent the same as those obtained from the lowest band [a], and it 
is therefore probable that the whole series from the top of the white 
quartzite (No. 5) to this horizon is of lower carboniferous age. 
Horizon {e). — At about 75 feet above the last horizon, a band 
of shale, i inch in thickness, has yielded the following forms : — 
Rhynchonella pleurodon, Phill. 
Chonetes hardrensis, Phill. 
Sptrifer sp. 
Disciva cf. newberryi, Hall. 
Orthoceras sp. 
Psammodus sp. 
and numerous casts of a bivalve. Immediately above this is a band of 
limestone with— - 
Produdus eora, d'Orb. 
Rhynchonella pleurodon, Phill. 
Orthotetes (?) sp. 
Aviculopecten sp. 
Euomphalus sp. ' 
'This is a small specimen closely resembling E. hecale, HaW, from the 
devonian of New York. 
( 40 ) 
