INDEX 



Algoman, 122 



Ailing, H. L., cited, 120 



Amawalk, 62 



Annsville creek, 12 



Anthony's Nose, 10, 11, 87 



Appalachian deformation, 114 



Artesian well damage claim, 100 



Ball mill pebbles, 91 



Barrell, Joseph, cited, 117 



Basalt, 56 



Bayley, W. S., cited, 126 



Berkey, Charles P., cited, 20 



Biotite-iaugite norite, 67 



Biotite-norite, 67 



Block, Adrian, 14 



Boyd Corners, 53 



Breakneck mountain, 10, 83 



Breakneck ridge, 10, '31 



Building stone, 82 



Bull Hill, 10, II 



Bull Hill tunnel, Catskill aqueduct, 98 



Byram gneiss, 19 



Cambrian unconformity, 73 



Cambro-Ordovician sediments, 9, 62, 

 III 



Canada Hill granite, 33, 39, 53, 71, 

 109; description, 52 



Catskill aqueduct, 11, 13, 20, 90; bul- 

 letin on geology of, 21 ; special 

 note of problems connected with, 

 93 



Christiansen, Hendrick, 14 



Clay, 89 



Climate, 14 



Cold Spring, 7, 9, 12 



Colony, R. J., cited, 20, 22, 86 



Connecticut State Survey, 19 



Conopus hollow, 18 



Contact and metamorphic products of 

 complex origin, 47 



Contact effects, 42 



Correlation problems, 119; summary. 



138 

 Correlation table, general, 140 

 Cortlandt area, 90 

 Cortlandt gabbro-diorite, 22 

 Cortlandt series, 21, 23, 31, 35, 39, 



42, 43, 60, 83 ; description, 66 

 Cretaceous peneplanation, 142 

 Crompond road, 64 

 Croton dam, 82 

 Crows nest, 10, 11 

 Crugers, 91 

 Crushed stone, 88 

 Crystalline limestones, 27, 47 

 Crystalline rocks, 6, 9; causes of 



variation in, 30 



Dana, James D., cited, 18 



Deformation products, 47 



Deformation structures, ^2 



Diabase, 56 



Diorite, 56, 67 



Dioritic rocks, 27 



Discovery and colonial history, 14 



Drift, 13 



Dunderberg, 10, 11, 31 



Dunite, 57 



Dutchess Junction, 89 



Dynamic influences or deformation, 44 



Eaton, Amos, cited, 16 

 Economic geology, 82 

 Economic resources, general sum- 

 mary, 92 

 Emery, 90, 92 

 Engineering geology, 82 

 Engineering undertakings, 92 

 Erosion feature, 10 



Farmer, Clarence N., cited, 20 

 Fault system, 23 

 Faults, 75; Mesozoic, 115 

 Fettke, Charles R., cited, 20, 22 



149 



