Biomarker and carbon isotope variation in coal and fossil wood of Central Europe through the Cenozoic

A comparison of terpenoid and leaf fossil vegetation proxies in Paleocene and Eocene Bighorn Basin sediments

“…4, Table 2). A similar observation has been noted by Bechtel et al (2008) where di/ (di + tri) ratios (not corrected for terpenoid production) were positively correlated with pollen-based estimates, but the terpenoids significantly overestimated the conifer abundance. The authors proposed a plausible argument, whereby pollen represented the flora within the catchment, whereas the terpenoids represented the very local peat-forming flora.…”

“…Diefendorf et al, 2012). Nevertheless, the similarities between Bechtel et al (2008) and this study are striking and suggest that diterpenoids overexpress conifers in the floral community.…”

On the fundamental difference between coal rank and coal type

“…However, their composition provides Modified after Hatcher and Clifford (1996). information on depositional environment and changes in peat-forming vegetation (Bechtel et al, 2003(Bechtel et al, , 2008Otto and Wilde, 2001;Otto et al, 1995Otto et al, , 1997Stefanova et al, 2002). Examples of the compositional diversity of hydrocarbon composition found in subbituminous coal are shown in Fig.…”

Optical and geochemical characterization of Upper Sinemurian (Lower Jurassic) fossil wood from the Lusitanian Basin (Portugal)

“…Numerous studies conducted over the recent years have investigated δ 13 C of fossil wood and its significance in palaeoenvironmental studies (e.g., Gröcke, 2002;van Bergen and Poole, 2002;Robinson and Hesselbo, 2004;Bechtel et al, 2007Bechtel et al, , 2008Diefendorf et al, 2010). The emerging use for this kind of data is related to differentiating between discrete, short-lived geological intervals at a time when the carbon cycle was globally perturbed and affected both the atmospheric and oceanic carbon reservoirs (e.g., Hasegawa, 1997;Gröcke et al, 1999a;Hesselbo et al, 2007; Duarte et al, 2010); b) synthetic composite log from the Polvoeira and Água de Madeiros reference sections of Sinemurian age at S. Pedro de Moel, Lusitanian Basin, Portugal (modified from Duarte et al, 2008;Azerêdo et al, 2010;chronostratigraphy from Comas-Rengifo et al, 2013).…”