REPORT OF THE STATE PALEONTOLOGIST 1901 561 



Prof. Hall had not as complete collections at hand as were 

 gathered by the numerous English and Swedish collectors and 

 that nearly all Levis forms were found in the Skiddaw slates; 

 that hence, vice versa, a more thorough investigation of the 

 Levis beds would bring to light still a considerable number of 

 species at present known only in Englandjand Sweden. In fact, 

 the provisional identification of the faunas collected at the Deep 

 kill points already to an increase of the forms common to both 

 continents. Furthermore, it is just these most characteristic 

 forms that are common to the Skiddaw, Swedish and Levis 

 faunas. Finally, the discussion of the next two succeeding 

 graptolite zones of the Deep kill section will show that their 

 succession, and hence most probably also that of the Quebec 

 zones, is identical with that of the Lake district and Scandi- 

 navian zones. This parallelism of the succession of the zones 

 can, however, be construed to mean only that these faunas 

 occupied these vast territories contemporaneously and in the 

 same succession. 



The complete list of graptolites of the Skiddaw slates given 

 by Miss Files {loc. cit. p. 526-27) indicates that the fauna of the 

 Deep kill zone, here under discussion, corresponds to a part of 

 the fauna of the middle Skiddaw slates or Arenig. These middle 

 Skiddaw slates have again been subdivided by Nicholson, Marr^ 

 and Files. Miss Files divides them into the lower Tetragraptus 

 bed, the Dichograptus bed and the upper Tetragraptus bed. As 

 no lists of the faunules of these subdivisions are furnished, a 

 final correlation of the Deep kill Tetragraptus zone with any of 

 these subzones would be inadvisable at present. But the facts 

 that the species of the multiramose dichograptids of the genus 

 Clonograptus,2 so common in the Main Point Levis beds, are 

 absent in the Deep kill zone and represented by Goniograptus, a 

 type of evidently later development; and that the younger genus 



^Geol. mag. 1894. 4tli ser. 1:122. 



^ In connection with the peculiar absence of species of Clonograptus may- 

 be pointed out the equally peculiar presence of two species of Bryograptus, 

 -a distinctly Cambric genus; one of these with a profusion of individuals. 



