Maryland Geological Survey 241 



plored and most of the work that has been done is of a reconnaissance 

 nature. Among the chief contributors to the geology have been Richard- 

 son, Selwyn, Dawson, McConnell, and Tyrrell, and their work is briefly 

 summarized in the recently published Index to the Stratigraphy of North 

 America. 1 The chief contributor to the paleobotany was the late Sir 

 William Dawson, 2 although minor contributions have been made by 

 Heer, 3 Newberry/ Lesquerex, 6 and Penhallow. 6 



The oldest horizon where Upper Cretaceous plants have been found is 

 in the so-called Mill Creek series which Dawson correlated with the 

 Dakota sandstone of the United States. From these beds Dawson 

 recorded the following forms : 



Alnites insignis Dawson ? 

 Aralia rotundata Dawson 

 Aralia westoni Dawson 

 Aralia sp. Dawson 

 Asplenium albertum Dawson 



1 Prof. Paper U. S. Geol. Survey, No. 71, 1912, pp. 693-704. 



2 Dawson, J. W., Note on the fossil plants from British Columbia collected 

 by Mr. James Richardson in 1872. Geol. Survey Can. Rept. of Prog, for 1872- 

 72, Appendix 1, pp. 66-71, pi. i. 1873. 



On the Cretaceous and Tertiary floras of British Columbia and the 



Northwest Territory. Trans. Roy. Soc. Canada, 1882, vol. i, sec. iv, 1883, pp. 

 15-34, pi. i-viii. 



On the Mesozoic floras of the Rocky Mountain region of Canada. 



Ibid., vol. iii, sec. iv, 1885, pp. 1-22, pi. i-iv, 1886. 



Note on the fossil woods and other plant remains from the Creta- 

 ceous and Laramie formations of the Western Territories of Canada. Ibid., 

 vol. v, sec. iv, 1887, pp. 31-37, 1888. 



On Cretaceous plants from Port McNeill, Vancouver Island. Ibid., 



vol. vi, sec. iv, 1888, pp. 71, 72, 1889. 



On the Correlation of early Cretaceous floras in Canada and the 



United States, and on some new plants of the period. Ibid., vol. x, sec. iv, 

 1892, pp. 79-93, 1893. 



On new species of Cretaceous plants from Vancouver Island. Ibid., 



vol. xi, sec. iv, 1893, pp. 53-72, pi. v-xii, 1894. 



:1 Heer, 0., Neue Denks. schweiz. Gesell. gesammt. Naturwiss., vol. xxi, 1855, 

 pp. 1-10, pi. i, ii. 



4 Newberry, J. S., Boston Jour. Nat. Hist., vol. vii, 1863, pp. 506-524. 



6 Lesquereux, L., Amer. Jour. Sci. (ii), vol. xxvii, 1859, pp. 360-363. 



6 Penhallow, D. P., Notes on Cretaceous and Tertiary Plants of Canada. 

 Trans. Roy. Soc. Canada (II), vol. viii, sec. iv, 1902, pp. 31-91. 



Report on a collection of fossil woods from the Cretaceous of Alberta. 



Ottawa Nat, vol. xxii, 1908, pp. 82-85, figs. 1-6. 



