the Horton-Windsor District, N. S. 159 



Tennesseean ( Chesterian equivalent). 



Windsor series (marine) 1100'+ 



Disco7iformity. 

 Tennesseean (Meramecian equivalent). 



Cheverie formation (terrestrial) 600-800' max. 



Characterized by Estheria dawsoni Jones and Leaia 

 saUeriana (Jones & Kirkby). 

 Disconformity. 

 Waverlian (Kinderhookian equivalent). 



Horton formation (terrestrial) 2800-3400'± max. 



Characterized by Aneimites acadicus 

 Dawson and Lepidodendron corrugatum 

 Dawson. 

 Unconformity. 

 Silurian and Precambrian slates and Devonian granodiorite. 



Horton Formation. 



Description. — Broadly the Horton may be divided into 

 a basal feldspathic arenaceous member (650-2,000 feet 

 thick) which carries rare f aunal remains, and an upper ar- 

 gillo-arenaceous shale member (300-1,400 feet thick) with 

 abundant Ostracoda and fish scales at various horizons. 

 The feldspathic sediments at the base flank the bordering 

 upland with a present mean dip of the warped contact 

 surface of about 12°. The composition of the immediate 

 contact beds is in direct relation to that of the underly- 

 ing rock. Where the latter is slate, for example, the low- 

 ermost Horton bed of several feet thickness is a compost 

 or agglomerate consisting of angular to subrounded frag- 

 ments of the underlying rock embedded in a paste of the 

 same material with but occasional pebbles from more 

 distant localities. Above this thin sheet of basal agglom- 

 erate the stream-deposited feldspathic grits and arena- 

 ceous shales so characteristic of the Horton were laid 

 down. The grits, in which the grain of the matrix ranges 

 from 7 mm. downwards, consist of transparent angular 

 quartz, rounded flakes of dark slate, kaolinite and mus- 

 covite. Conglomeratic basal beds carry in addition peb- 

 bles of vein quartz, quartzite, or slate. The coarser beds 

 are heavily cross-bedded, whilst the slates are typically 

 marked by ripples predominantly of the current type. 



The peculiarity of the succeeding beds lies in the 

 presence of frequent zones of laminated, siliceous, and 

 argillaceous shales, with which are commonly associated 

 ironstone concretions, abundant spheroidal calcareous 

 concretions, and occasional thin argillaceous limestones 



