TYPE | CruSsH GLACIAL 
Clean sands, :toclastic fragments. Heterogeneous mass of finer and coarser 
cross-strati material, compact, angular grains of 
MATRIX rounded g minerals and rocks; some fresh feld- 
spar; some grains partially rounded 
and partially angular. 
Generally lop andshape, angular to | Generally local materials, but a consid- 
uniform g§ showing portions of erable proportion from distant sources. 
may be scilimbs of folds; frac- Little, if any, assortment; all sizes up 
landslides,nes; tension cracks. to masses of several tons. Pebbles 
PEBBLES nor snubb¢ic fragments. faceted, rounded edges, snubbed ends, 
polished and striated surfaces, with 
| striae generally parallel to long axis of 
stone, but often showing two or more 
directions. 
} 
May be ferrh parent rock. 
Generally dark grayish with bluish and 
COLOR ually high] 
greenish tints, occasionally ferrugi- 
nous. 
Stratificationedding, all traces of | Till and corresponding ancient forma- 
ed. Crossedding may have been tions, usually not bedded; sometimes 
well develd. obscure stratification, and layers when 
cycle finer separated show glazed and striated 
upon and { surfaces; sometimes pockets, lenses, 
rials; som and beds of coarser and finer stratified 
BEDDING formities, | material with cross-stratification in- 
etc., but m cluded in the unstratified mass. 
original st Fluvio-glacial materials show all grada- 
dip; lime tions from no stratification to well- 
composed marked fluviatile type. 
mains. | Marine glacial bowlder beds show well- 
| marked stratification and alternation 
of coarser and finer beds. 
Conformableionformity by over- | Rests on striated, smoothed, and polished 
RELATIONS TO SUB- nothing esjulting or slickensiding. surfaces of older rocks or older por- 
JACENT Rocks marine act tions of the same formation. 
Ne 
