lOO ROYAL SOCIETY OF CANADA 



this series of articles, and the writer hopes may prove of interest to 

 palgeobotanists. 



The terrane in which these plant remains are found is believed 

 to cover a considerable interval of geological time, and not to be con- 

 fined to the Middle Devonian as many have been led to believe from 

 Sir William's determination of the flora; it should not be overlooked 

 that the plant remains determined by Sir J. William Dawson were 

 collected from about 140 feet of measures of a terrane thousands of 

 feet in thickness; and, while species of plants like Calamités Suclcovii 

 occur through a thickness of 400 feet or more, there are others that 

 are confined to special portions of the plant beds; and it is these species 

 which give character to the flora. 



Hartt's Section. 



It is somewhat unfortunate for our present purpose of studying 

 the vertical distribution of the species of plants in the terrane of the 

 Little Eiver Group, that Sir William Dawson has not indicated the 

 special beds at the Fern Ledges, etc., from which came the species that 

 he ïïas described. Tlîîs may have been because Professor Hartt 

 ha,d not marked the specimens which he collected in such a way that 

 this could be done. 



It has thus happened that while the bullc of the flora can be placed 

 in relation to the beds from which the specimens came, a number of 

 species, not described nor named at the time that Professor Hartt made 

 up his list, can only tentatively be assigned to certain beds. 



The following table will show the range of the Equisetales in the 

 beds of the sections at Bay Shore, as far as it is at present known. 

 It is partly compiled from Professor Ilartt's notes in the^ Acadian 

 Geology, pp. 516 to 533, and partly from the observations of other 

 collectors who have been to these localities in later years. The three 

 subfloras which appear to be present are indicated. A higher sub- 

 flora appears to exist in the Upper Cordaite shales (Murphy's Point, 

 etc.), but its plants are poorly preserved and Equisetales are rarer there. 



