No. 3, January, 1922] PALEOBOTANY . 191 



phora, Leguminosites, Sophora, Antholithus, Apocynophyllum, and Burserites. Species of 

 Heliconia and Trigonia, previously known from the Miocene of Colombia, are recorded, and 

 the seed of a fossil species of Entada is described. — E. W. Berry. 



1264. Chaney, R. W. A fossil flora of the Puente formation of the Monterey group. Amer. 

 Jour. Sci. 2: 90-92. 1921. — About IS species, 2 of which are marine algae and the remainder 

 terrestrial plants, are recorded from the Miocene diatomaceous shales of southern California. 

 They are said to indicate a climate much like that of the present in the same region, and con- 

 sist largely of moist woodland and stream border plants, probably transported by streams to 

 their resting place in the marine sediments of shallow coastal waters. — E. W. Berry. 



1265. GoTHAN, W., UND K. Nagel. tJber einen cedroiden Coniferenzapfen aus dem 

 Unter-EocUn der Greifswalder Oie. [On a cedar cone from the lower Eocene of Greifswalder 

 Oie.] Jahrb. Preuss. Geol. Landesanstalt 41: 121-131. PL 8. 1920. — A well preserved 

 phosphatized cone from the lower Eocene (Ypresian stage) of north Germany is described 

 under the name of Apterostrobus cedroides. Minor differences are pointed out which distin- 

 guish it from the modern Cedrus. — E. W. Berry. 



1266. Jessen, Knud. Moseunders0gelser i det nord0stlige Sjaelland. Med Bemaer- 

 kninger om Traeers og Buskes Indvandring og Vegetationes Historic. [Bog investigations in 

 northeast Sjaelland, with remarks on the immigration of trees and shrubs and the history of 

 the vegetation.] Danmarks Geol. Unders0gelse 2^^:1-289. 1920. — This work contains a sum- 

 mary of previous results in the study and interpretation of the late Glacial and post Glacial 

 bogs; detailed accounts, both geologic and ecologic, of the Danish bogs; lists of animals and 

 plants found; and an account of the time of immigration and the subsequent history in Den- 

 mark of a large number of trees and shrubs. The pollen-statistical method is largely used 

 and frequency curves are constructed for the different species. The results appear to point 

 to the validity of the so-called Blytt-Sernander hypothesis of past alternations of climate. 

 This study starts with late Glacial times, considered, on the basis of the geological work of 

 DeGeer and Lid6n, to have been about 11000 B. C. or slightly earlier. This was the time of 

 the Older Dryas flora of Dryas octopetala, Salix polaris, Salix reticulata, Beiula nana, etc., 

 indicating a subarctic climate in Denmark with July temperatures of 8-12°C. This was 

 followed by the Allerod period, marked by the introduction of Betula intermedia, B. pubescens, 

 Juniperus communis, Pinus silvestris, Populus tremula, etc., indicating a temperate conti- 

 nental climate with July temperatures of 12-15°C. The Allerod period was foUow^ed bj'' the 

 Younger Dryas Period, with a recurrence of the climate and flora of the Older Dryas Period. 

 Following this was a long warm period estimated as having lasted for about 7000 years, com- 

 mencing about 7500 B. C, during which the climate in that region was warmer than at present. 

 This warm period, which corresponds to the Ancylus Lake and the Litorina sea in the history 

 of the Baltic, is divided into (1) an older Mullerup, Pine, or Boreal Period, during which 

 the climate was dry and rather warm, with such plants as Alnus glutinosa, Tilia cor data, 

 Ulmus glabra, Cornus sanguinea, Corylus avellana, Prunus padus, Pinus silvestris, etc., and 

 (2) a mixed oak forest or Atlantic Period during which the climate was warm and humid, with 

 July temperatures of about 17°C. The plants included Acer platanoides, Fraxinus excelsior, 

 Humulus lupulus, Trapa natans, and, toward the close of the period, Fagus silvatica. Then 

 followed (3) the beginning of the Beech Period, about contemporaneous with the Bronze Age, 

 at which time July temperatures reached 18°C. and the climate was again dry and warm. 

 At about 400 B. C. the temperature lessened and the climate became more humid. This 

 corresponds to the Limnaea Sea stage of the Baltic, or to the Iron Age in Denmark, and is 

 known as the Sub-Atlantic Period. The latter continued to the beginning of the Historic 

 Period, which, in Denmark, was about 800 A. D. — E. W. Berry. 



1267. Johnson, T., and J. G. Gilmore. The occurrence of a Sequoia at Washing Bay. 

 Proc. Roy. Dublin Soc. 16: 345-352. PI. 13-U. 1921.— The presence of Sequoia Couttsiae 

 Heer in the upper Oligocene of Washing Bay, Ireland, is described, and from a microscopic 

 study of the foliage its reference to the genus Sequoia is confirmed. — E. W. Berry. 



