330 ■ APPENDIX 



Survey for 1894-95, containing the elaborate Memoir 

 of C. R. Van Hise on the pre-Cambrian Geology of 

 North America. It is a very valuable contribution 

 to the literature of this difficult subject, and will con- 

 stitute a standard book of reference : though I think 

 the use of the term " Algonkian " for groups of beds 

 which are in part basal Palaeozoic and in part Eozoic 

 or Archaean is to be deprecated, and scarcely suffi- 

 cient importance is attached to the labours of the 

 early Canadian explorers in this field. 



In the past summer I was enabled to spend a few 

 days, with the assistance of my friend Mr. H. Tweed- 

 dale Atkin, of Egerton Park, Rock Ferry, in examin- 

 ing the supposed pre-Cambrian rocks of Holyhead 

 Island and Anglesey. Fossils are very rare in these 

 beds. As Sir A. Geikie has shown, the quartzite of 

 Holyhead is in some places perforated with cylindri- 

 cal worm-burrows, and in the micaceous shales there 

 are long cylindrical cords, which may be algae of the 

 genus PalcBochorda, and also bifurcating fronds re- 

 sembling Chondrites ; but I saw no animal fossils. I 

 have so far been unable to discover organic structure 

 in the layers of limestone associated with apparently 

 bedded serpentine in the southern part of Holyhead 

 Island. In central Anglesey there are lenticular 



