Organic geochemistry and petrography of Lower Cretaceous Wealden black shales of the Lower Saxony Basin: The transition from lacustrine
oil shales to gas shales.
A non-metric multidimensional scaling (NMDS) was performed with the abundance of Ephemeroptera taxa between the zones from Itaipu Reservoir, considering the longitudinal gradient (riverine, transition and lacustrine
)) and between collection periods.
Key words: salmon; sockeye salmon; anadromous fish; marine fish remains; south-central Alaska; Eklutna Lake; lacustrine
sediments; nitrogen isotopes
present geochemical and isotopic characteristics of actual lacustrine
sediments from the hydrothermal lake Specchio di Venere on Pantelleria Island, Italy.
The Lower Permian Pingdiquan Formation contains deep lacustrine
black mudstones, oil shales, and dolomitic mudstones with a total thickness of 50-650 m .
Key words: Ndumo Game Reserve, pan, riverine, lacustrine
, floristics, riparian, wetland.
However, given that movement from Lake Powell to the San Juan River covered >300 river-km (48 km through lacustrine
habitat), the potential for movement through Lake Powell seemed plausible.
The small fish featured that day were tulingan, dilis, dulong and galunggong (mackerel tuna, anchovy, lacustrine
These activities can indicate relevant historical and economic changes to the lacustrine
landscape (Nicholson, 1998; Hui et al., 2008; Obregon et al., 2011).
Megacycles are composed of thick packages of braided fluvial sandstones that are sharply overlain by thinner packages of "lacustrine
" sediments that accumulated following episodic downdrop of the basin floor (Browne and Plint 1994; Plint and Browne 1994).
Specially, in lacustrine
areas like the Basin of Mexico, in which the Texcoco Region is located, buried structures modify the behavior of the subsoil.
In this study, UCMs in five lacustrine
biodegraded oils with different biodegradation ranks from Nanxiang Basin, China, were separated with comprehensive two-dimensional gas chromatography/time-of-flight mass spectrometry (GC x GC/TOFMS) and identified by standard materials validation, structured chromatograms, and mass spectrums of target compounds.