PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER LE 
The Central Basin of Tennessee, Wells Creek Basin and High Bridge, Kentucky. 
The disturbed area at Kentland, Indiana. 
The Mississippi Valley. 
Arbuckle and Wichita Mountains, Oklahoma. 
The Black Hills, South Dakota. 
The Great Basin. 
Formations in Utah and California. 
I. NEWFOUNDLAND 
Along the west coast of Newfoundland fossiliferous Ordovician rocks are ex- 
posed at many places. These were examined by Logan (1863, p. 870) who 
separated them into four divisions, lettered K-N. According to Schuchert and 
Dunbar (1934, pp. 63-69) these four divisions form a natural group for which 
they proposed the name “Table Head series.” 
TABLE HEAD SERIES 
The lower Table Head (K, L) is composed mostly of limestone somewhat 
massively bedded in the lower part but the main mass consisting of thin-bedded 
limestone weathering to rubble, the sequence measuring 811 feet. Middle Table 
Head (M) consists of dark limestone and interbedded black shale, a total of 
270 feet. The upper part of the series (N) is composed chiefly of black car- 
bonaceous shale 300 feet thick. 
Brachiopods occur in all parts of the sequence in more or less abundance. 
The following genera and species are known: 
Acrotreta gemma Billings 
Aporthophyla aurora (Billings) 
Archaeorthis electra (Billings) = A. new species 
Camerella parva Billings 
C. tumida Cooper 
Ectenoglossa nympha (Billings) 
Ectenoglossa sp. I 
Idiostrophia perfecta Ulrich and Cooper 
Idiostrophia plicata Cooper 
Obolus cyane (Billings) 
Obolus sp. 1 
Onychoplecia kindlei Cooper 
Onychoplecia sp. 1 
Orthidium fimbriatum Cooper 
Pelonomia delicatula (Billings) 
Pleurorthis imbecilis (Billings) 
Pleurorthis sp. 1, 2 
Porambonites sp. 2 
Ptychoglyptus ? kindlei Cooper 
Rhysostrophia sp. 2 
Correlation of Table Head series—The facies of the Table Head series 
is that of a black shale and limestone environment and is strongly suggestive of 
the Liberty Hall facies of the Edinburg formation or the Whitesburg formation 
of Tennessee. The trilobites of the Table Head are similar to those from the 
