Palynology, organic geochemistry and carbon isotope analysis of a latest Ordovician through Silurian clastic succession from borehole Tt1, Ghadamis Basin, southern Tunisia, North Africa: Palaeoenvironmental interpretation

Late Ordovician to early Silurian acritarchs from the Qusaiba-1 shallow core hole, central Saudi Arabia

“…(Hill andMolyneux, 1988) does not enable precise correlation with Qusaiba-1. In Tunisia, acritarch-poor samples have been recorded from a Rhuddanian interval below and within a 'hot-shale' (Vecoli et al, 2009), but are attributed to the vesiculosus and younger graptolite biozones and are apparently younger than the interval studied here. Results of palynological studies across the Ordovician-Silurian boundary in Bohemia (the local boundary between the Kosov and Llandovery series) were published by Dufka and Fatka (1993).…”

Heterogeneity of the Lower Silurian Longmaxi marine shale in the southeast Sichuan Basin of China

“…Although shale gas abundantly exists in boring "homogeneous" like fine-grained mudstone, it actually has obvious vertical heterogeneity in terms of lithofacies, mineralogy, petrophysics, gas content variation which determines the sweet spots, gas fairways, or producible areas of economic potential (Vecoli et al, 2009;Hulsey, 2011;Abouelresh and Slatt, 2012;Slatt and Rodriguez, 2012;Hammes and Fr ebourg, 2012). Many studies also have been carried out to figure out the controlling factors that lead to the vertical heterogeneity of shale.…”

Palynology and palynofacies analysis of a Silurian (Llandovery–Wenlock) marine succession from the Precordillera of western Argentina: Palaeobiogeographical and palaeoenvironmental significance

“…Libya (Paris et al, 2012;Thusu et al, 2013); 17. Tunisia (Vecoli et al, 2009);18. India (Sinha et al, 1998).…”

“…When possible (in all but sample 8), two hundred and fifty specimens were counted per sample processed at the University of Liège in order to obtain the relative abundance of the different palynomorph groups throughout the section, and to compare fluctuations in palynomorph distribution with changes in the depositional environment (De Vernal et al, 1987;Vecoli et al, 2009). Slides prepared in Belgium were used for the present analysis given that they were subjected to oxidative treatment lightening the colour of carbonised palynomorphs and liberating them from amorphous organic matter (AOM).…”