n6 



these volcanic arms {Apophysis i). From the station 

 eastward to Inch Arran point and light (1-5 miles) the 

 shore cliffs are entirely of this rock, and on the Inch Arran 

 cliff there are conspicuous inclusions of crystalline rocks 

 surrounded by radial fracture and shrinkage lines. From 

 Inch Arran (at low tide) along the shore past the Bon Ami 

 islets and the "Gateway", the diabase of this apophysis 

 continues to Stewart's or Fossil cove. 



The Devonian section of Stewart's cove extends along a 

 sea frontage of 1,700 feet (510 m.), but is divided by 

 Apophysis 2, which has a 900 foot (280 m.) section. The 

 fossiliferous strata are bounded on the south by Apophysis 

 3, and the actual exposed thickness of these sediments is 

 about 430 feet (130 m.). The rocks are soft calcareous 

 shales with thin limestone bands, thicker toward the top and 

 hardened at contact with the diabase (see contact between 

 shales and Apophysis 2). The strata have a uniform dip 

 of 70°-75° N.E. 



Apophysis 1 lies above these beds, but their contact is 

 buried under the beach sand. 



The highest beds are, beginning at the north: 



1 Coral limestones with very abundant and diverse 



Favosites; also Zaphrentis and Halysites 25 ft. (8 m..j 



2. Barren shales 15 " (4-5 m.) 



3. Ash beds with Rensselaeria stewarti 1 " ( -3 m.) 



4. Calcareous shale with gastropods (Coelidium) . . 2 " ( -6 m.) 



5. Ash beds alternating with thin limestones and 

 shales all highly fossiliferous. Ash beds with 



R. stewarti 30 " (9 m.) 



6. Soft shales with lamellibranchs 10 " (3 m.) 



7. Thin limestones and soft shales profuse in corals 



and brachiopods 95 " (29 m.) 



Apophysis 2. In the middle of this is a detached mass of 

 hardened glazed Devonian shale 30 by 15 feet (9 by 4-5 m.), 

 at an angle to the normal dip ; then follow from the south 

 end of the volcanics downward : — 



H. Compact limestone 10 " (3 m.) 



y. Coarse ash bed 12 " (3-6 m.) 



iO. Impure limestone with shale 165 " (50 m.) 



11. Calcareous shale with Sieberella pseudogaleata 



and corals 30 " (9 m.) 



A fauna of 80 species has been described and illustrated 

 from these beds by Clarke and their vertical range through 



