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Author : Georgia. State Geologist,Joseph William Spencer
Publisher : Unknown
Page : 446 pages
File Size : 41,7 Mb
Release : 1893
Category : Geology
ISBN : HARVARD:32044055490817
Author : Douglas H. Erwin
Publisher : Columbia University Press
Page : 342 pages
File Size : 51,7 Mb
Release : 1993
Category : Science
ISBN : 9780231074667
The culmination of more than fifty years of research by the foremost living expert on plant classification, Diversity and Classification of Flowering Plants is an important contribution to the field of plant taxonomy. In the last decade, the system of classifying plants has been thoroughly revised. Instead of describing every individual family, Takhtajan includes descriptions in keys to families, which he calls "descriptive keys." The advantage of descriptive keys is that they give both the characteristic features of the families and their differences. The delimitation of families and orders drastically differs from the one accepted by the Englerian school and from the one accepted in Arthur Cronquist's system. Takhtajan favors the smaller, more natural families and orders, which are more coherent and better-defined, where characters are easily grasped, and which are more suitable for information retrieval and phylogenetic studies, including cladistic analysis (because it reduces polymorphic codings).
Author : Jan Engelbert Muller
Publisher : Geological Survey of Canada
Page : 21 pages
File Size : 43,8 Mb
Release : 1980
Category : Geology
ISBN : 066010606X
Author : Geological Society of London
Publisher : Unknown
Page : 606 pages
File Size : 50,5 Mb
Release : 1856
Category : Electronic journals
ISBN : RMS:RMSSTGGL000000054$$$C
Vols. 1-108 include Proceedings of the society (separately paged, beginning with v. 30)
Author : B. D. Webby
Publisher : Columbia University Press
Page : 497 pages
File Size : 41,9 Mb
Release : 2004
Category : Nature
ISBN : 9780231126786
Two of the greatest evolutionary events in the history of life on Earth occurred during Early Paleozoic time. The first was the Cambrian explosion of skeletonized marine animals about 540 million years ago. The second was the "Great Ordovician Biodiversification Event," which is the focus of this book. This is the first book devoted specifically to establishing the global patterns of differentiation of Ordovician biotas through time and space. It provides extensive genus- and species-level diversity data for the many Ordovician fossil groups and presents an evaluation of how each group diversified, with assessments of patterns of change, and rates of origination and extinction.
Author : Geological Survey of Pennsylvania
Publisher : Unknown
Page : 292 pages
File Size : 44,8 Mb
Release : 1878
Category : Coal
ISBN : MINN:31951000883301G
Author : Thomas Sterry Hunt
Publisher : Unknown
Page : 290 pages
File Size : 51,5 Mb
Release : 1878
Category : Geology
ISBN : PSU:000029043217
Author : Geological Survey of Pennsylvania
Publisher : Unknown
Page : 292 pages
File Size : 55,9 Mb
Release : 1878
Category : Coal
ISBN : NYPL:33433012575951
35 vols. are atlases.
Author : Samuel Hubbard Scudder
Publisher : Unknown
Page : 552 pages
File Size : 41,6 Mb
Release : 1890
Category : Insects, Fossil
ISBN : UOM:39015052489666
Author : Samuel Hubbard Scudder
Publisher : Unknown
Page : 688 pages
File Size : 52,5 Mb
Release : 1890
Category : Insects, Fossil
ISBN : UCBK:C075281915
Author : Boston Society of Natural History
Publisher : Unknown
Page : 626 pages
File Size : 55,6 Mb
Release : 1894
Category : Natural history
ISBN : UOM:39015035552648
Author : John William Salter
Publisher : Unknown
Page : 372 pages
File Size : 43,8 Mb
Release : 1883
Category : Paleontology
ISBN : UCR:31210002594487
Author : Anonim
Publisher : Unknown
Page : 344 pages
File Size : 40,6 Mb
Release : 1891
Category : Electronic
ISBN : BSB:BSB11505141
Author : Geological Survey of India
Publisher : Unknown
Page : 354 pages
File Size : 47,9 Mb
Release : 1891
Category : Geology
ISBN : HARVARD:32044102949997
Author : John Wells Foster,Josiah Dwight Whitney
Publisher : Unknown
Page : 494 pages
File Size : 44,8 Mb
Release : 1851
Category : Copper mines and mining
ISBN : UOMDLP:aet6770:0001.002