76 ROCHESTER ACADEMY OF SCIENCE. [J^n. II, 



NO. OK DESCRIPTION OF 



SAMPLE. DEPTH. SAMPLE. 



35. 1800'. Rather dark gray to drab limestone, effer- 



vescence slow at first, but becomes strong 

 on heating the HCl ; a magnesian lime- 

 stone. 



36. 1850'. Same as preceding with small fragments of 



white gypsum. 



37. 1900', Greenish and brownish red marlytes or cal- 



careous shales. Some fine white chips, 

 probably selenite. Drillers log " through 

 the limestone." Upper part of the lower 

 division of the Onondaga Salt group. 



38. 1950'. Mostly greenish, finely arenaceous and but 



slightly calcareous shales (?). Efferves- 

 cence increased by heating the HCl ; but 

 does not become strong. Some brownish 

 red chips. " Sandy shale " of driller. 



Ditto. 



Top of ist rock salt stratum, 15' thick. 



Greenish marlyte, effervescence strong 

 after being a short time in HCl. Drillers 

 log "40' of shale." 



42. 2085'. Top of 2d rock salt stratum, 50' in thick- 



ness, 2135' bottom of rock salt. 



43. 2136'. Mainly fine chips of a drab marlyte, effer- 



vescence marked after a short time in cold 

 HCl. A few chips of greenish, argilla- 

 ceous shale. 

 2138'. Bottom of well. Drillers log " tools drawn Onondaga 

 3' below base of salt bed." Salt group. 



