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The discovery of a turtle in the Early Jurassic(185 million years before present) Kayenta Formation of northeastern Arizona provides significant evidence about the origin of modern turtles. This new taxon possesses many of the primitive features expected in the hypothetical common ancestor of pleurodires and cryptodires, the two groups of modern turtles. It(More)
The hypothesis that the Martian wave of darkening might be a frostheaving phenomenon has been examined. Consideration of the water-vapor sorption characteristics of a silicate mineral surface at temperatures below freezing leads to the conclusion that, without strongly deliquescent salts to attract and retain liquid water in the Martian soil, frost-heaving(More)
This paper presents a framework for estimating losses for residential mortgage loans. At the core is a transitions-based probability of default model which yields directly observable cash-flows at the loan level. The estimated model includes coefficients on unemployment , Loan to Value ratio and interest rates, all of which allow a macroeconomic scenario to(More)
The detrimental impacts of credit booms, property booms and firm over-leverage are well-established in a growing literature highlighting their effects on household consumption , firm investment and economic growth. The link between credit-fuelled property market booms and firms' ability to service their debts has however up to this point not been studied.(More)
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