Zobrazeno 1 - 10
of 145
pro vyhledávání: '"J. R. L. Allen"'
Autor:
J. R. L. Allen
Publikováno v:
Geological Journal. 9:181-208
Carbonate units occur in varying numbers in the fine-grade members of the alluvial fining-upwards cyclothems present in the Lower Old Red Sandstone of the Anglo-Welsh outcrop. They closely resemble contemporary soil-carbonates (calcretes) and hence s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3844a8c431c557d65bbfa40a562b1c5e
https://doi.org/10.1002/gj.3350090207
https://doi.org/10.1002/gj.3350090207
Autor:
J. R. L. Allen
Publikováno v:
Geological Journal. 3:1-20
Scoured surfaces occur in the upper part of the Lower Old Red Sandstone of the Anglo-Welsh cuvette between cyclothems consisting of intraformational conglomerate→sandstone→siltstone. The conglomerates are formed chiefly of rocks which can be matc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e5b3352150864cc8551c298675dd905b
https://doi.org/10.1002/gj.3350030101
https://doi.org/10.1002/gj.3350030101
Autor:
B. P. J. Williams, J. R. L. Allen
Publikováno v:
Geological Journal. 16:255-269
Trace fossils of Beaconites type are found abundantly and widely in the Old Red Sandstone magnafacies of the British Isles, particularly in fluviatile deposits, where they occur in or closely associated with channel sandstones. Because of their giant
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::281e7b6962e7288870f4aa54c77f1853
https://doi.org/10.1002/gj.3350160405
https://doi.org/10.1002/gj.3350160405
Autor:
J. R. L. Allen
Publikováno v:
Geological Journal. 7:129-146
The secondary flow and transverse changes of water depth in curved stream channels are exploited to develop a quantitative, partly empirical model of the way lithology varies vertically in deposits accumulated through processes of lateral deposition.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6ebc467897fb510a50fbe301b6d115b3
https://doi.org/10.1002/gj.3350070108
https://doi.org/10.1002/gj.3350070108
Autor:
J. R. L. Allen
Publikováno v:
Geological Journal. 9:1-16
The lateral lithological variability of 18 stratigraphically close fluviatile cyclothems is analysed in three ways: (1) qualitatively, (2) by means of the upwards facies transition probability matrix, and (3) using the non-parametric Mann-Whitney U s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::db3accee54540c0390c1651204beb1a8
https://doi.org/10.1002/gj.3350090101
https://doi.org/10.1002/gj.3350090101
Autor:
J. R. L. Allen
Publikováno v:
Geological Journal. 17:31-47
On the southwest-facing slopes of a bedrock ridge lying between Cardigan Bay to the north and the Afon Teifi to the south stands a group of hills in which 30-35 m of cross-laminated and parallel-laminated sands with lenticular upward-fining gravel se
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a715e1b01f2e8a2d1040deec96f88b4a
https://doi.org/10.1002/gj.3350170104
https://doi.org/10.1002/gj.3350170104
Autor:
J. R. L. Allen
Publikováno v:
Geological Journal. 3:187-236
Asymmetrical ripple marks formed by flowing water are described and classified on geometrical form, physical size, and hydrodynamic conditions of origin. By analysing models it is demonstrated that the character of cosets of cross-strata resulting fr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::00bb4de002c182a706bf24b48c68726c
https://doi.org/10.1002/gj.3350030201
https://doi.org/10.1002/gj.3350030201
Autor:
D. L. Dineley, J. R. L. Allen
Publikováno v:
Geological Journal. 11:1-14
The motorway cuts approximately 1900 m of strata, of which about 56 per cent are continuously exposed in numerous long sections, a new standard being afforded for the Lower Old Red Sandstone in the southern Welsh Borders. The succession recognized is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::633430d9ae0e593439eecd04db4b8b01
https://doi.org/10.1002/gj.3350110101
https://doi.org/10.1002/gj.3350110101
Autor:
J. R. L. Allen
Publikováno v:
Geological Society, London, Special Publications. 175:239-252
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::87c90dedfa88660a89311325833718e2
https://doi.org/10.1144/gsl.sp.2000.175.01.18
https://doi.org/10.1144/gsl.sp.2000.175.01.18