Yucatan subsurface stratigraphy: implications and constraints for the Chicxulub impact: comment and reply

Article Abstract:

Pecheux and Michaud refute the work of Ward et. al. saying that the deposit of limestone breccia found in the subsurface Yucatan and K-T sections in Chiapas and Guatamela is a result of a single event, the Chicxulub impact. Keller and Stinnesbeck rebut that the 20 m layer separation in Chiapas and Guatamela, the absence of basement rocks below the topmost glass-bearing layer, unaltered carbonate clasts and absence of glass in the rest of the breccia proved that deposition of breccia was a multi-event.

Analysis, Chiapas, Mexico, Guatemala, Yucatan, Mexico, Breccia

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Delta carbon-13 values and radiocarbon dates of microbial biomarkers as tracers for carbon recycling in peat deposits

Article Abstract:

Old carbon from Holocene deposits was most likely incorporated directly into the peat-forming vegetation through carbon dioxide fixation. Methanogenesis was a significant process in forming peat but there was no evidence for methanotrophic activity.

Netherlands, Archaeabacteria, Archaebacteria, Peat, Paleogeography, Holocene paleogeography

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New C isotope stratigraphy from southwest China: implications fro the placement of the Precambian-Cambrian boundary on the Yangtze Platform and global correlations

Article Abstract:

The carbon isotopic peak S2 can be correlated with the peak I in northern Siberia and the carbon isotope feature D in Mongolia. This shows that the Precambrian-Cambrian boundary of Chinese successions should be closer to marker A.

China, Cambrian period

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