Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 4 of 4 for “"Ammonoid"”.
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Hydrodynamic and structural constraints on ammonoid shell shape
This work examines the structural role of the ammonoid shell in supporting hydrostatic load and the role of shell shape in facilitating swimming. The history of studies of the role of the shell in supporting hydrostatic load is discussed first, and is followed by an analysis of the function of the …
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Selected Famennian (Late Devonian) events (Condroz, Annulata, Hangenberg) in Sardinia and in the Carnic Alps: conodont biostratigraphy, magnetic susceptibility and geochemistry.
… regression associated with an extinction of few ammonoid groups. The Annulata event to a transgression associated with a global spread of the ammonoid Platyclymeniae annulata. The Hangenberg event is a major event, that took place in a complex phase of eustatic variations that affected severely …
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Fayetteville and Imo Shales: Punctuated Upper Mississippian Shallowing Upward Sequence, Southern Ozark Region, Northern Arkansas
… basinal environments. However, recent study of ammonoid taphonomy and sequence stratigraphy indicate that the Imo is a regressional interval, and, was deposited in a much shallower environment than previously surmised (Stevens and Manger, 2018). Supporting evidence includes tempestite deposits …
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The Aptian evolution of the Galve sub-basin (Maestrat Basin; E Iberia)
… calibrated by geomagnetic polarity analysis and ammonoid and rudist biostratigraphic data. These sequences are consistent with the major transgressions and sea level falls recorded in other coeval Tethyan localities, indicating a significant eustatic control of the sedimentary succession, …