Fig. 20

Examples of muddy hyperpycnal flow deposits (facies S4). a Core example showing graded muddy intervals, resting on erosional bases (yellow arrows); b Detail of the core surface, showing abundant dispersed plant remains (white arrows); c Complex graded bed preserved in a cemented concretion. Note the multiple fining and coarsening upward cycles, accumulated over a basal erosional surface (yellow arrows). a–c Offshore Upper Jurassic deposits from the Vaca Muerta Formation, Neuquén basin, Argentina; d Normally graded silt levels, suggesting an accumulation from a fluid mud flow; Offshore Lower Jurassic deposits of the Los Molles Formation, Neuquen Basin, Argentina. e Detail of d, showing a high content of dispersed plant remains (white arrows)