Now showing items 1-10 of 97
Yunia dichotoma, a lower devonian plant from Yunnan, China
(Elsevier, 1991-07-10)
This paper describes a new genus and species, Yunia dichotoma, collected from the Posonchong Formation of Siegenian age in the Wenshan district of Yunnan, China. The spiny axes are characterized by cruciate dichotomy. ...
Patterns in tropical leaf litter and implications for angiosperm paleobotany
(Elsevier, 1994-03)
One hectare of undisturbed Amazonian forest, containing about 175 species of trees larger than 10 cm diameter at breast height, was studied to determine the relationship between high-richness forest and the autochthonous ...
Current status of the Progymnospermopsida
(Elsevier, 1976-01)
The three progymnosperm orders, Aneurophytales, Protopityales, and Archaeopteridales, are characterized and analyzed. The possibility that some of the apparent taxonomic diversity of the Aneurophytales and Archaeopteridales ...
The primary vascular system of Callixylon
(Elsevier, 1979-08)
The primary vascular system of Callixylon (main stem axes of Archaeopteris) is composed of a discontinous cylinder of longitudinal bundles from some of which traces diverge radially in a regular, helical pattern. Tangential ...
Techniques for preparation of pyrite and limonite permineralizations
(Elsevier, 1982-02)
Procedures are presented for the preparation of fine-polished surfaces of pyrite permineralizations, and demineralized thin-sections of limonite permineralizations. A major new feature in both procedures involves the ...
New information on Bostonia perplexa--an unusual member of the calamopityaceae from North America
(Elsevier, 1992-05-22)
A calamopityacean axis exhibiting multiple segments of primary xylem surrounded by secondary vascular tissue is analyzed here for its morphological and systematic significance. The plant is fundamentally protostelic with ...
A reinvestigation of Diichnia Read from the New Albany Shale of Kentucky
(Elsevier, 1992-12-03)
The type material of Diichnia Read, supplemented by several additional specimens, has been restudied and a lectotype designated. Special attention has been paid to the nature of the primary vascular system, the pattern of ...
Studies on Paleocene and Early Eocene Apatemyidae (Mammalia, Insectivora) I. Dentition of Clarkforkian Labidolemur kayi II. Labidolemur and Apatemys from the Early Wasatchian of the Clark's Fork Basin, Wyoming
(Museum of Paleontology, The University of Michigan, 1982)
New North American Plesiadapidae (Mammalia, Primates) and a Biostratigraphic Zonation of the Middle and Upper Paleocene
(Museum of Paleontology, The University of Michigan, 1975)
Aletodon gunnelli, A New Clarkforkian Hyopsodontid (Mammalia, Condylarthra) from the Early Eocene of Wyoming
(Museum of Paleontology, The University of Michigan, 1977)