516 Reviews — Work on Mesozoic Floras. 



I. — Some Eecent "Work on Mesozoic Floras. 



1. On" the Cketaceoits Flora of Rfssian Sakhalin. Ey 

 A. Krtshtofovich. Journ. of the Coll. of Sci. Imp. IJniv. of 

 Tokyo, vol. xl, art. 8, pp. 73, with 15 text-figures, 1918. 



2. Mesozoic Floras of Queensland. By A. B. Walkom. Part I 

 contiuued : The Flora of the Ipswich and Walloon Series, 

 (c) Filicales, etc. Queensland Geol. Surv. Publ., No. 257, 1917, 

 pp. 66, with 10 plates and 12 text-figures. Parti concluded: 

 {d) Ginkgoales, {e) Cycadophyta, (/) Coniferales. Queensland 

 Geol. Survey Puhl., No. 259, 1917, pp. 48, with 9 plates. 



3. The Earlier Mesozoic Floras of New Zealand. By E. A. 

 Newell Arber. New Zealand Geol. Survey Palseontological 

 Bull., No. 6, 1917, pp. 80, with 14 plates and 12 text-figures. 



1. The Island of Sakhalin possesses a fossil flora, rich in species, 

 which has hitherto been regarded as exclusively of Miocene age. 

 Kryshtofovich — who recently visited the western coast of the 

 island, examining nearly 200 outcrops with plant remains — claims, 

 however, to have established that this so-called Miocene flora belongs 

 to several geological horizons, not only of the Tertiary period but 

 also of the Cretaceous. He points out that so-called " Arcto- 

 Tertiary " floras in other parts of the world might also repay thorough 

 revision. 



The part of the Cretaceous of Sakhalin known before, and repre- 

 sented by marine deposits, has been hitherto considered as belonging 

 to the Senonian, and its thickness estimated at 3,500 feet. But the 

 present author's work has indicated the presence of Turonian, 

 Cenomanian, and probably even older divisions of the Cretaceous, 

 thus making the total thickness at least 7,000 feet. He proposes 

 a classification of these Cretaceous rocks, based on the plant remains. 



2. The two memoirs by Walkom with which we are here 

 concerned form the conclusion of his study of the flora of the 

 Ipswich and Walloon Series, of which the first instalment appeared 

 in 1915 as Publication 252 of the Queensland Geological Survey. 

 It is pointed out that the results so far obtained indicate that the 

 flora of the Walloon Series is Jurassic, probably corresponding to the 

 Liassic or Lower Oolite of Europe, Avhile the Ipswich Series is 

 Trias.sic, or possibly equivalent to the so-called Rhaetic beds of various 

 areas. 



3. The plant impressions discussed in Arbor's memoir upon the 

 Mesozoic Floras of New Zealand are derived from rocks whose age 

 ranges from Triasso-Ilhsetic to Neocomian. In the provinces of 

 Canterbury and Otago Ilhaetic floras occur. Jurassic floras are met 

 with in the provinces of Canterbury, and especially Southland, 

 while a Neocomian flora occurs in Auckland, but no evidence of an 

 undoubted Upper Jurassic flora has yet been met with. Prior to the 

 commencement of the work of which the results are recorded in the 

 present paper, there were only eleven valid records of Mesophytic 

 plants from New Zealand, but the author has been able to add 



