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A long-term goal of vertebrate biostratigraphers is to construct a microvertebrate biostratigraphy for lower Mesozoic rocks that complements and extends the mammal-based biostratigraphy in place for Upper Cretaceous-Recent deposits. Here we report substantial progress toward achieving this goal based on the distribution of microvertebrate fossils in the Upper Triassic Chinle Group of the wester...

The Pierre Shale is a marine deposit that accumulated in the Cretaceous Western Interior Seaway during the onset of Laramide tectonism in the southern Rocky Mountains region. In the eastern part of the Raton Basin near Trinidad, Colorado, ammonite biostratigraphy suggests that the base of the Pierre Shale lies within or slightly above the Lower Campanian Scaphites hippocrepis III ammonite range...

Biostratigraphy of Oligo-Miocene marine deposits Central Iran basin based on calcareous nannoplanktons


 Abstract
 An innovative method of accessing connected data sources on the internet is keyword search. We propose to route keywords only relevant in order reduce substantial processing cost search queries throughout all providers. a novel for computing top-k routing plans by considering their propensity contain responses specific query. use summary links between components referencin...