The Ediacaran Period (ca. 635–541 Ma) witnessed the earliest paleontological evidence for macroscopic animals (i.e., Ediacara biota) and geochemical observations of largest carbon cycle anomaly in Earth history Shuram Excursion, SE). Numerous hypotheses have been proposed origins SE, ranging from primary seawater to syn- or post-depositional diagenesis. Despite intensive theoretical work publis...

Fossil feathers often preserve evidence of melanosomes-micrometre-scale melanin-bearing organelles that have been used to infer original colours and patterns of the plumage of dinosaurs. Such reconstructions acknowledge that evidence from other colour-producing mechanisms is presently elusive and assume that melanosome geometry is not altered during fossilization. Here, we provide the first tes...

Metalliferous black shales exhibit a wide range of physical and chemical characteristics. They can be enriched in many different metals, and the metals can be in a variety of geochemical states. Depositional and geological histories of these shales are diverse. Some metalliferous black shales contain relatively high concentrations of organic matter whereas others do not. Because of elevated car...

Taphonomic processes affecting bone post mortem are important in forensic, archaeological and palaeontological investigations. In this study, the application of tissue microarray (TMA) analysis to a sample of femoral bone specimens from 20 exhumed individuals of known period of burial and age at death is described. TMA allows multiplexing of subsamples, permitting standardized comparative analy...

• Potential new method for palaeopathological analysis. Assessment of pathological conditions using portable x-ray fluorescence. Impact diagenesis on trace elements in human skeletal remains. This study aims to investigate the potential X-ray fluorescence spectrometry (pXRF) identifying archaeological Bone element distribution relation known disease categories is analyzed pXRF from femora 73 in...

Both competition and burial are important factors that influence plant growth and structuring plant communities. Competition intensity may decline with increased burial stress. However, experimental evidence is scarce. The aim of this study was to elucidate the role of burial stress in influencing plant competition by investigating biomass accumulation, biomass allocation, and clonal growth per...

Citation: Takasu H and Nagata T (2015) High Proline Content of Bacteria-Sized Particles in the Western North Pacific and Its Potential as a New Biogeochemical Indicator of Organic Matter Diagenesis. Front. Mar. Sci. 2:110. doi: 10.3389/fmars.2015.00110 High Proline Content of Bacteria-Sized Particles in the Western North Pacific and Its Potential as a New Biogeochemical Indicator of Organic Mat...

In this study, a variety of test and analysis methods, such as cast thin sections, fluorescent scanning electron microscopy, fluid inclusions, etc., were comprehensively used combined with logging data, sedimentary systems, burial history other research results, to systematically study the diagenesis characteristics Middle Permian Lower Wuerhe formation–Lower Triassic Baikouquan formation reser...

Bone and alike materials, including ivory and antler, have an important place among prehistoric remains as they record a wealth of information on the past ways of life in the form of morphological and structural changes as well as in their chemical and isotopic composition. Such materials generally exhibit a high degree of hierarchy and essentially consist of collagen molecules and hydroxyapati...

where Eq. A1.1a is for dissolved species, and Eq. A1.1b is for solid species. Here, t is time, and x is the depth coordinate below the sediment–water interface. U is the advection (burial) velocity. Rj values are the rates of chemical and biochemical reactions, and nij is the stoichiometric coefficient of species i in reaction j. Q is the sediment porosity. The factor j is equal to (1 2 Q)r, wh...