114 Gregory — Igneous Origin of the " Glacial Deposits " 



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confused by sliding of block 

 on block and of parts of the 

 mass on the shales beneath. 

 Within this tangled mass of 

 blocks the conglomerate is 

 distributed as chunks and 

 lenses and stringers and snr- 

 ficial patches in a most 

 capricious manner. It was 

 found impracticable to deter- 

 mine the distribution and 

 continuity of the various ig- 

 neous and sedimentary beds 

 involved in this complex, but 

 it is believed that these dis- 

 turbed beds mark the loca- 

 tion of the principal intru- 

 sion. That the assumed 

 intrusion is local, somewhat 

 in the nature of a neck, is 

 suggested by the fact that 

 the beds near at hand, north, 

 south and west of the dis- 

 turbed area, are continuous 

 and in their usual positions. 

 It is possible, also, that 

 a dike extends eastward 

 through the heavily-mantled 

 knolls and buttes, but no defi- 

 nite trace of it was discov- 

 ered. 



The age of the intrusion is 

 unknown beyond the fact 

 that it is post-Jurassic, but 

 the field evidence demands 

 no date earlier than that as- 

 signed to the other volcanic 

 features of the Navajo Reser- 

 vation, viz : Tertiary time. 

 As in the case of the Mule 

 Ear and the Moses Rock 

 localities, the igneous origin 

 of conglomerate at Garnet 

 Ridge appears to be demon- 

 strated. 



Corroborative evidence. — 

 At a number of localities 



