The quality of coal and hydrogeological characteristics in deposit 'Delići and Peljave-Tobut' near Ugljevik

Geological study of 'Delici and Peljave - Tobut' coal deposit, located in north-eastern part of the Republic of Srpska (B&H), has given a new insight into geological structure of coal-bearing series and quality of coal. Coal-bearing series was formed in a lower Miocene lake and has complex geological-tectonic structure and litho-facial diversity. Two coal seam are identified within this series - the older one, so-called the Main coal seam (developed throughout the deposit; with major coal reserves) and the younger one - Upper coal seam, which is of a restricted areal extent. Coal from this deposit has a variable ash content -34.91% on average in the Main seam and 44.58% on average in the Upper seam. This coal has an average sulfur content of 3.73% in the Main seam and 2.73% in the Upper seam. An average moisture content is 19.07% in the Main seam and 18.26% in the Upper seam. An average lower heating value is 111.671 kJ/kg for the Main seam and 7.952 kJ/kg for the Upper seam. Petrographic study of coal have shown that the coal of this deposit has high content of huminite, increased content of liptinite, low content of inertinite and increased content of mineral matter. Densinite is a dominant maceral of huminite group, while ulminite is less abundant. The content of other macerals of this group is low

The Middle Cenomanian basal series of Planinica, Western Serbia

Sedimentary rocks of the Upper Cretaceous basal series found at the village of Planinica, Western Serbia, are composed of thick coarse clastics and beds and intercalations of medium- to fine-grained clastics. The series lies transgressively over Jurassic serpentinite and peridotite, and under Upper Miocene marlstone and marly limestone. Sedimentary, petrographic, paleontological, and biostratigraphic characteristics of the basal series are described and its lithological members and their structural features are identified. From medium-grained sandy matrix in thick coarse clastics, two ammonite taxa, four brachiopod taxa (including the new taxa Orbirhynchia oweni and "Terebratula" n. gen. et sp.), and eleven echinoid taxa are described. The brachiopod species Kingena concinna Owen is used in dating the basal series as Middle Cenomanian, whereas limestone fragments in coarse clastics correspond to the Late Albian and Early Cenomanian