NO. 2.] STRATIGRAPHIC RESULTS. 127 



Bathonian. It must not, however, be forgotten that kindred species (from the 

 group of the Hastati) also occur in the Bajocian; in the Upper Bajocian Bel. 

 Wurttemhergicus 0pp. (= fusiformis Quenst. non Park.), and in the Lower 

 Bajocian, in the zone of Trigonia navis among the Belemnites generally 

 designated as Bel. suhdavatus Voltz, specimens may be found which are 

 decidedly Hastati, and which appear very similar to Bel. Wurttemhergicus 

 and Beyrichi. 



Still less than Belemnites sp. (cf. Beyrichi 0pp.), the fragments possibly 

 belonging to the group of the Canahculati can serve for the determination 

 of the age of the rocks west of Elmwood. The small, detached fragment of 

 Belemnites sp. indet. 2 (PI. I. fig. 24), possibly does not come from the stra- 

 tum here under consideration, but may have fallen from higher strata. 



Thus only the two Brachiopods, Lingula Beani Phill. and Discina 

 reftexa Sow. sp. furnish any clue to the determination of the age of the 

 deposits containing Pseudomonotis Jacksoni n. sp., and an abundance of 

 Lamellibranchs. They point to the 



Bajocian. 

 As it has hitherto only been in the Blea Wyke Beds {and in the 

 "Dogger") of Yorkshire that the two species have been observed occurring 

 together, we might probably also designate the strata exposed NW. of Elm- 

 wood at a height of 23—33 ft. above the sea, in which these two species 

 occur together, as 



Lower Bajocian, 

 almost corresponding to the zone of Leioceras opalinum and Ludwigia 

 Murchisonce. The great vertical distance — circ. 350 ft. — from the hard, 

 sandy marl and soft marl containing Pseudomonotis Jacksoni, Lingula 

 Beani, Discina reflexa, etc. to the clay of the Lower Callovian (at 

 Windy Gully), lying at a height of 400 ft., may be mentioned as an 

 additional support to our determination of the age of the strata west of 

 Elmwood. 



Marine Jura deposits other than those here mentioned cannot be ob- 

 served in the material before me. 



