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40 articles covering from Alaska to Baja CA. 573 pp. Oversize/weight ... Read more

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This book brings together the widely scattered observations about Permian rocks of the northern part of Pangea. In Volume 1 broad overviews are provided for Pangean paleogeography and continental positioning as well as faunal and floral extinctions. Several papers examine Permian paleoclimates and climatic cyclicity using computer modeling, traditional geological evidence from climatic indicators, or a combination of both approaches. More detailed, and more conventional correlation techniques are discussed in papers dealing with biostratigraphic and paleogeographic aspects of the most important fossil groups in the Permian. The reader will find a synthesis of current geologic knowledge and an outline of modern trends of interpretation for a time interval which is receiving increased attention. ... Read more

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This digital document is a journal article from Palaeogeography, Palaeoclimatology, Palaeoecology, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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Correlation of the Korean Peninsula with the neighboring South and North China blocks has been one of the most important and long debated issues in East Asian tectonics. The eastward extension of the Chinese collisional belt between the South and North China blocks into the Korean Peninsula is still in dispute. The lower Paleozoic sedimentary rocks in South Korea, the Joseon Supergroup, accumulated in the Okcheon belt which has been proposed as the suture zone or the block boundary between the South and North China blocks in Korea. The Joseon Supergroup comprises five different lithostratigraphic units, and has been proposed to represent two tectonostratigraphic blocks bounded by the Honam Shear Zone (HSZ) in the Okcheon belt; among them, the Yeongweol Unit in the western part of the HSZ is correlated with South China and the Duwibong Unit in the eastern part of the HSZ with North China. To test the above geodynamic interpretation, this study analyzed the Nd isotopic composition of Upper Cambrian conodonts from the Duwibong and Yeongweol units. The difference of the @?"N"d (T) values between the Upper Cambrian Duwibong and Yeongweol units is about 3@? units. Compared to a wide range of the @?"N"d (0) values in the modern oceanic basins, this slight difference can be regarded as a variation in a same paleo-watermass. The @?"N"d (T) values of the two units are consistent with coeval values from North China, and this suggests that the Duwibong and Yeongweol units shared the same oceanic watermass with the North China. Considering current early Paleozoic paleogeographic reconstructions, the Nd isotopic signatures of North China, Duwibong and Yeongweol units may be independent of Laurentia and Baltica and thus can be indicative of another unique oceanic watermass. In contrast to the previous tectonic interpretations, the same paleoceanographic signatures shown by the Duwibong and Yeongweol units and North China and recent developments suggest that the Yeongweol Unit in the early Paleozoic Joseon Supergroup is not correlated with South China but correlated with North China, and the Korean Peninsula and North China block may have been included in a larger continental block, the Sino-Korean block. The collisional belt between the South and North China blocks may not extend into the Korean Peninsula. ... Read more