GEOLOGY OF THE PORT LEYDEN QUADRANGLE 23 



Feet Inches 

 A massive bed of blue granular limestone, mottled and lam- 

 inated and with pebbles of blue dove limestone.. i 6 



Hard, gray white limestone with spots of crystallized calcite 9 



Bluish gray, thin bedded limestone, with ripple marks and 



ostracods 2 2 



Shaly, dirty white mud limestone beds, mud cracked i 6 



Bluish subgranular, thin bedded limestone 9 



Blue dove, hard, mottled limestone, shaly below, traces of 



fossils I 4 



Hard, gray granular limestone, pinkish tinge, much calcite 6 



Thin, ripple marked, dirty white, mud limestone beds i 



Hard, blue gray subgranular limestone, sand grains and ostra- 

 cods above 2 . 6 



Hard, gray white limestone, less earthy than usual; calcite 



spots 9 



Subgranular, blue, laminated limestone; welded contact with 



above 2 5 



Very massive, gray white, earthy limestone, Irregular splitting. 5 9 



Massive blue dove limestone in two layers; laminated; sty- 



liolites and traces of fossils i 9 



Thin and thick bedded, blue subgranular limestone ; massive 



basal layer ; laminated ; much mud cracked 7 9 



Earthy, impure, gray white beds; massive and irregular split- 

 ting; lower 12-18 inches hard, gray white, calcite spotted, 



bunchy surfaced 3 11 



Gray white, impure, earthy, blocky beds i • 8 



Impure, gray white, reddish tinged, earthy limestone, with 

 purer layer of reddish limestone at base; quite massive; 



summit less red 7 8 



Bluish black, fine, hard limestone, like 2d beneath but unfossil. i 



Gray to blue gray, magnesian looking limestone in 3-^-Inch 



beds 2 g 



3 heavy layers of hard, bluish black limestone ; ringing ; multi- 

 tude of small fossils, lamellibranchs, cephalopods, one- 

 celled Tetradium, etc 4 7 



Red and green, impure, calcareous, sandy mudstone, large sand 



grains; upper 6 inches thin bedded, rest massive 7 



Very sandy firm green limestone, full of quartz grains I 3 



Hard, gray white, somewhat sandy limestone or dolomite ; 



calcite spots i 2 



Hard, ringing, green, calcareous sandstone 10 



Red, sandy, rotten shale i 6 



More solid, red and green calcareous sandstone; rots easily.. 4 



Red and green, rotten, calcareous sandstone 9 



Green and red arkose ; perhaps calcareous 1 1 



Conglomerate resting on Precambric 10 



Total 71 



