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Title: The sedimentology of carboniferous fluvial and deltaic sequences : the Roaches grit group of the south-west Pennines and the pennant sandstone of the Rhondda valleys
Author: Jones, Colin Michael Author
Awarding Body: Keele University
Current Institution: Keele University
Date of Award: 1977
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This thesis describes two Carboniferous fluvio-deltaic sequences in which river channel fills are dominant, the Roaches Grit Group (Namurian R2b) in the south-west Pennines and Lower Pennant Measures (Westphalian C) in the Rhondda Valleys. In addition, sedimentation in non-meandering sandy rivers is reviewed and discussed. Non-meandering rivers can be classified into straight and two braided types. In the former, alternate bars attached to the channel sides give rise to solitary sets of cross-bedding which are eroded during falling stage. In braided rivers, channel fill characteristics vary with discharge regime. These range from regimes with pronounced short lived flood peaks with rapid rising and falling stages, probably producing relatively uniform cross-bedded fills, to those which show limited variation between high and low stage and where high stage sediments are mainly reworked. Multiple channel braided rivers should have channel abandonment sequences showing alternating periods of bedform movement and ponded water. Palaeocurrents vary with regime and some braided rivers may show a variance similar to that of meandering rivers.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available