Origin fluvial

The analysed sandstones with accompanying mudstones, claystones and subordinate conglomerates are of fluvial origin and interlayered with marine and deltaic deposits (Waksmundzka 2008). 

Primary estuaries are formed from terrestrial and/or tectonic processes with minimal changes from the sea that have essentially preserved their original characteristics. The four categories within primary estuaries are former fluvial valleys, former glacial valleys, river dominated, and structural. 

Extensive overlying sedimentary rocks of fluvial origin of the Great Hungarian Plain are very poor in vertebrate finds. Until the 1970s, when large-scale, accurately dated deep-boring schemes were embarked upon, there were very few data available. 

Faults which cut through alluvial, fluvial and deltaic sediments have been included in this study. While some of the faults are synsedimentary and interpreted as delta collapse structures (Dart et al., 1994), most focus in this paper is given to faults which affected the sediments some time after deposition. These structures relate to large, block bounding faults with throws up to 100 m, whose origin is related to the NNE-SSW trending extensional regime still active in this area. Faults dominantly trend WNW-ESE and exhibit dip-slip towards north. 

Phenols derived from lignin degradation were used as markers to determine the origin of waters of the Seine estuary in France. Thus, fluvial run-off contains syringic, hydroxyben-zoic and vanillic phenols, whereas upstream penetrating marine waters contain cinnamic phenols derived from the estuarine herbs. In the maximum turbidity zone the vanillic acid (38) to vanillin (39) ratio increases due to aerobic degradation of lignin . ... 

Fluvial. Originating in, or derived from, a stream or river. 

For those interested in mineral matter in coal, an awareness that some partings may be of volcanic origin may be useful in explaining the distribution of some of these layers and the occurrences of some unusual components, such as strontium, phosphate, or uranium. Volcanic ash partings are likely to be more widespread and uniform in texture, composition and thickness than the more common partings of fluvial origin. They are also more likely to show marked differences from layer to layer, and to contain exotic mineral or chemical components. 

Coarse-grained proximal deposits predominate in the Furado and Japoata-Penedo areas (Fig. 2), whereas fine-grained sandstones and mudstones predominate in the Caioba area. This distribution pattern represents a portion of the original deposi-tional association which was preserved within the late-developed rift basin. The connotation of proximal , middle and distal as used in this paper thus applies to the relative location within the central part of the fluvial system. The contemporaneous, most proximal alluvial fan and most distal lacustrine deposits are not preserved within the present basin configuration. 

The relatively low 5 0 values of the Angel Field and Gidgealpa Field carbonate cements can be explained in terms of either a meteoric-water incursion and/or elevated precipitation temperatures. Low 5 0 values in minerals can also be achieved through the interaction between sea water and volcaniclastic sediments under low-temperature conditions (Morad De Ros, 1994). However, because of the late-stage origin of the carbonate cements and the fluvial nature of the Namur Sandstone, this possibility need not be considered in the present context. 

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