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NEW YORK STATE MUSEUM 



very similar to the sandstone described by Brainard and Seeley 

 as forming the base of the Chazy on Valcour island, and else- 

 where along the lake. 1 The rock is peculiar and precisely like 

 layers which are found in the Potsdam-Calciferous passage beds. 

 Glittering cleavage faces of calcite, mottled with quartz grains, 

 appear on broken surfaces. The quartz grains are set in a mosaic 

 of minute dolomite crystals, while here and there later calcite 

 has been deposited as a network around the quartz grains in 

 crystals up to an inch in length, replacing the dolomite in those 

 portions. 



Above this layer appears some 20 feet of blue, crystalline lime- 

 stone, following which are beds of gray limestone, spotted with 

 yellow and full of fossils, to a thickness of 30 feet. The most 

 extensive exposures are along the low ridge east of the big bend 

 in Tracy brook. These upper beds are the same as those which 

 form the base of Brainard and Seeley's section near Chazy vil- 

 lage, but the basal 20 feet is below anything there seen. 2 



This lower Chazy limestone is, with the exception of the 

 Pleistocene deposits, the youngest rock now found in the Mooers 

 sheet area. There can be no question however that the remainder 

 of the Chazy (750 feet thick), the Black river and Trenton lime- 

 stones and the Utica slate (of undetermined thickness but at least 

 1000 feet) were originally deposited over the entire area. Then 

 followed emergence and the long continued existence as a land 

 region. 



The Morrisonville well. Within the past two years drilling for 

 oil has been in progress at Morrisonville, in Plattsburg township. 

 The locality is 4 miles south of the map limits and nearly 3 miles 

 west of its eastern edge. As soon as it was learned that drilling 

 was in progress, a request was sent that a record and samples be 

 kept. An unfortunate fire, however, destroyed the engine house 

 in which the record was placed. A few samples had been kept 

 elsewhere, and what follows is based on these together with the 

 coinciding statements of the owners and the driller, these giving 



^ul. geol. soc. Amer. 1891. 2:295. 

 'American geologist. Nov. 1SS8. 2:324. 



