摘要:

Hugh's talent for experimental research was precocious. He began work in David Griggs' laboratory as an undergraduate, and later, as a graduate student, earned on his M.S. thesis the comment “the best Ph.D. thesis by a master's student” from Griggs. His 1962 Ph.D. thesis on the transition from brittle to ductile deformation in crustal rocks is a textbook study in laboratory simulation of geological processes, still widely quoted and ci

ISSN:0002-8606    

DOI:10.1029/88EO00069

年代:1988

数据来源: WILEY

摘要:

At the Precambrian‐Cambrian boundary, the course of life on Earth underwent a dramatic change that culminated in the rise of predators and other complex animals, a group of paleontologists agreed at a conferece last week.Just prior to 590 million years ago, the ecology of life in the oceans was very simple; soft‐shelled multicellular animals called Ediacara lived in apparent harmony with vast mats o f bacteria and algae that covered the seafloor, dependent on the photosynthesis or chemosynthesis of their one‐celled hosts for their existence. According to the consensus reached by the scientists, this symbiotic and apparently global “Garden of Ediacara” fell early in the Cambrian Period, as the mats declined and food chains multiplied with new animals that, for the first time in Earth's history, preyed on other livi

ISSN:0002-8606    

DOI:10.1029/88EO00071

年代:1988

数据来源: WILEY

摘要:

Eos periodically lists information on recently accepted doctoral dissertations in the disciplines of geophysics.

ISSN:0002-8606    

DOI:10.1029/EO069i008p00107-02

年代:1988

数据来源: WILEY

摘要:

A major interdisciplinary debate has been in progress over the last few years regarding the cause for the mass extinction of a large number of species, including the dinosaurs, at the end of the Cretaceous Period of geologic history (∼ 65 million years ago). One important theory under discussion is that the event was triggered by the collision with Earth of an extraterrestrial object, such as an asteroid or comet of ∼10‐km dia

ISSN:0002-8606    

DOI:10.1029/88EO00074

年代:1988

数据来源: WILEY

摘要:

William Jason Morgan, Jr., entered geophysics through a lucky break — for both him and geophysics. He was a graduate student in physics at Princeton University, looking for evidence of gravity waves and possible changes in the gravitational constant, when Walter Elsasser came over from the Geology Department looking for a post doc who wished to explore some mantle convection problems. Since he enjoyed living in Princeton, and Elsasser's problems sounded interesting, he accepted. The few small steps from the Physics Building to the neighboring Geology Department turned out to be the longest move so far in his professional career, as he is now a professor of geophysics at Princeton. In any case, his mind has made giant leaps since th

ISSN:0002-8606    

DOI:10.1029/88EO00075

年代:1988

数据来源: WILEY

摘要:

Twelve minority students were named AGU Scholars for the 1987–1988 academic year. They are among the recipients of scholarships under the American Geological Institute (AGI) Minority Participation Program. This designation recognizes AGU's continued strong support and substantial contribution to this program. Four of these students were designated AGU Sea Grant Scholars because part of the support for this program comes from a matching grant from the National Oceanic and Atmospheric Administration's Sea Grant Program, which is aimed at increasing the number of minority students studying in fields related to the development of marine and coastal resources. The AGU Scholars, who are all in courses related to the broad areas of Union interes

ISSN:0002-8606    

DOI:10.1029/EO069i008p00116

年代:1988

数据来源: WILEY