ELIZABETHTOWN AND PORT HENRY QUADRANGLES Jl 



It is added that the section like that of Valcour island begins 

 with a basal zone with L i n g u 1 a b r a i n e r d i which, however, 

 is not considered as representing '' one horizon holding a definite 

 place in the time scale, but as a tangential sandstone marking the 

 base of the invading sea " and that the fauna is chiefly a brachiopod 

 one, characterized by Rafinesquina champlainensis, 

 Rafinesquina incrassata, Plaesiomys platys, 

 Camarella varians, Raphistoma stamineum^ 

 Maclurites magnus, Isot^lus harrisi, Thale- 

 ops arctura and Leperditia limatula. Four of these, 

 viz, Rafinesquina champlainensis, Plaesiomys 

 platys, Maclurites magnus and Leperditia 

 limatula are cited as characteristic of the second or Mac- 

 lurites magnus fauna at Valcour island. 



The base of the Qiazy is exposed at the east shore of Bulwagga 

 bay where a few feet of the subjacent Beekmantown formation are 

 seen. The Maclurites are observed here to come in directly above 

 the basal 25 feet of slates and sandstone. Only about 50 feet are 

 exposed along this shore in continuous section. The fniddle and 

 higher beds are excellently shown along the shore, west of the 

 light-house and in the pastures back of the shore. The last 26 feet 

 which are best exposed west of and within the fort are peculiar 

 in several respects. Most striking among these and all Chazy beds 

 in this section are the white and black banded limestones (Cig^i^^), 

 the bands, which appear on weathering, exhibiting in many layers 

 fine examples of brecciation and recementation of the broken frag- 

 ments, also oblique striation and plunge structure and other evi- 

 dences of deposition in turbulent waters. 



The Chazy is brought up again by a fault close to the southern 

 boundary of the sheet. It is also here characterized by its fauna, 

 notably numerous specimens of Maclurites magnus, as 

 belonging to the middle division. 



The section in the Westport area is not so easily accessible since, 

 for the most part, the rocks are only exposed in a vertical cliff 

 along the shore. Several outcrops appear also farther inland, along 

 Beaver brook and the highway. Near the top several beds are 

 found that either are not exposed or absent in the Crown Point 

 section. One of these consists of unfossiliferous heavy bedded 

 limestone with a basal bed of crinoidal limestone containing 

 numerous large sand grains and composed in places nearly entirely 

 of a small apparently new Camarotoechia. The base of the forma- 

 tion is well exposed, resting on the Beekmantown, south of Cole 



