Добрый день, Коллеги. Важное сообщение, просьба принять участие. Музей Ферсмана ищет помощь для реставрационных работ в помещении. Подробности по ссылке
1. The timing and location of major ore deposits in an evolving orogen: the geodynamic context
2. Global comparisons of volcanic-hosted massive sulphide districts
3. Tectonic controls on magmatic-hydro-thermal gold mineralization in the magmatic arcs of SE Asia
4. Timing and tectonic controls in the evolving orogen of SE Asia and the western Pacific and some implications for ore generation
5. Correlating magmatic-hydrothermal ore deposit formation over time with geodynamic processes in SE collision Europe
6. Contrasting Late Cretaceous with Neogene ore provinces in the Alpine-Balkan-Carpathian-Dinaride collision belt
7. Auriferous arsenopyritepyrite and stibnite mineralization from the Siflitz-Guginock Area (Austria): indications for hydrothermal activity during Tertiary oblique terrane accretion in the Eastern Alps
The Jurassic and Cretaceous of Sierra Catorce, which yielded the mol-luscan fauna for the first large paleontological monograph on Mexico (Castillo and Aguilera, 1895), comprises from the base: the Oxfordian Huizachal formation and Zuloaga Limestone and the Kimmeridgian to Tithonian La t aja Formation which is overlain by the Valanginian Taraises Formation. I he richly fossiliferous La Caja (— 53 m) is divided into two members. The I I Pastor Member, below, contains two condensed fossiliferous units, one near the base and one near the top; the El Verde Member, above, has sporadically distributed ammonite fauna. <...>
Duane Allan Smith has been called many things, but no one can deny he is Colorado’s most prolific historian, surpassing even the late, great LeRoy Hafen. The Trail of Gold and Silver is Smith’s fiftieth book. The University Press of Colorado’s Timberline Books series, which features the best current work on Colorado as well as classic reprints, proudly presents this master historian’s survey of 150 years of Colorado gold and silver mining. <...>
In spite of its remote location and its cold and stormy weather, Antarctica has attracted seal hunters, whalers, and scientists all of whom have contributed to the exploration of this continent. The names of these explorers are preserved by many of the topographic and geologic features of Antarctica, as well as by the names of its coastal areas and surrounding oceans.
It took me approximately 15 years to put together the material included in the first edition of my book, Trilobites, a Photographic Atlas, and see it published by the University of Chicago Press in 1975. The task included, first of all, the fun part—the treasure hunt—digging out the specimens from their burial rock at several locations around the world. Looking for the best-preserved find was often a frustrating enterprise. Once the specimens were brought home, the unwanted cover matrix had to be chipped away, typically under the optical microscope with a variety of tools; and often the specimens had to be prepared for photography using appropriate techniques to enhance their appearance.
Key moments in European history can be identified with relative ease, whereas periods of formation or disintegration require more lengthy analysis and argument to define their significance. In prehistory, on the other hand, rarely can significant moments be identified, although with the characterisation of broad periods, change, gradual or otherwise, can be described. The essential outlines of the periods discussed in this book are well known; they pivot around one clearly identifiable event, the cataclysmic eruption of the Santorini (Theran) volcano sometime in the late 17th or late 16th century B.C.
Ultrabasic rocks of bahiaitic type occur as bands in amphibolite at Tovqussaq. It is concluded that the ultrabasics are formed in situ in the amphibolite in zones of stress concentration. Stress of high order in connection with chemically, and mechanically generated heat is regarded to be the cause of the metamorphic differentiation that was responsible for the formation of the ultrabasic rocks. From the results of the examination of the hypersthenes of the Tovqussaq region it seems reasonable to assume that the 'hypersthene may be used as a geological thermometer. Ultrabasic rocks are described from other pre-cambrian areas and the peri-dotites of orogenic zones are discussed. The interpretation of the ultrabasic rocks as being the products of metamorphic, rather than magmatic processes seems to have general validity. Finally, the peridotites are compared with eclogites vvhicii were probably formed in a similar way.
Recent expeditions to East Greenland, under the leadership of Dr. Lauge Koch, have succeeded in bringing back collections of the greatest importance from many localities and from many formations; but, at least in so far as the invertebrate remains are concerned, there are few to rival in interest and beauty of preservation the Upper Jurassic am monite faunas of Cape Leslie.
To what has already been said in the Introduction to the first part To f .this memoir I may add that the magnitude of the material was not fully appreciated when that Introduction was written. Dr. Aldinger's large collection consisted essentially of ammonites; and the reader who peruses the present part will see at once that the beauty of the preservation of these ammonites of which I spoke is in striking contrast to the general defectiveness of the Oxfordian and Lower Kimmeridgian invertebrates illustrated in the first part. Compared with the ammonites, the few other mollusca in the collection were so negligible that I did not hesitate to include them in the account, partly because their description by specialists would have meant a long delay. Since February, however, and as the other invertebrates in Mr. Rosenkrantz's collections were gradually being unpacked, there accumulated such a mass of material that in spite of much of it being named by Rosenkrantz, I began to regret having included fossils other than cephalopoda in my account. <...>
