Analysis of an Upper Palaeozoic transgressive sequence in southwest County Cork, Eire

Graham, John R.

doi:10.1016/0037-0738(75)90037-8

Cited by 15 publications

(14 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Member 2 forms a distinctive sandy unit amidst the mud-dominant strata of the Lower Carboniferous series pointing to a regressive phase and can be traced very far, particularly to the west, as Graham's (1975) and Naylor's (1 975) descriptions suggest. It reaches a maximum observed thickness (600 m) in our study area.…”

Section: Introductionmentioning

confidence: 95%

“…(1974), Sleeman et nt. (1974), MacCarthy (1974), Naylor (1975), Graham (1975), . It seems worthwhile mentioning that mapping carried out by one of the authors, and palynological dating by Dr Clayton, Dublin, has led to a partial revision of chronological boundaries, so that the majority of the succession recently investigated had to be updated from an Upper Devonian to a Lower Carboniferous age.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Wave‐generated structures and sequences from a shallow marine succession, Lower Carboniferous, County Cork, Ireland

1977

View full text Add to dashboard Cite

In a Lower Carboniferous formation south of Cork, Ireland, characterized by sand/mud alternations at varying scales, several lithotypes could be singled out on the basis of relative sand content and primary sedimentary structures. The lithotypes are arranged in several types of sequences: coarsening upwards, coarsening‐fining upwards, random, and in rare instances: fining upwards. With increased gross sandcontent the sand intercalations thicken and show a richer array of structures, reflecting a wider range of energy conditions. The majority of the structures is interpreted as wave generated. Current formed structures play an insignificant role. Tidal effects could not be ascertained. The alternation of low‐ and high‐energy lithotypes, occurring in sandy as well as muddy parts of the sequences is explained as resulting from the interplay of storm and fair weather conditions. The effect of shoaling bathymetry is reflected in sequences by an increasing importance of high‐energy lithotypes. The environment of deposition can be visualized as a muddy shallow marine platform on which longshore directed sandy shoals were formed under the influence of wave action. Depending on the degree of wave agitation and the availability of sand the shoals reached different stages of maturity: incipient, submerged or emergent. The sequential type encountered in vertical sections depends on the location of the line of logging and varies laterally as sandlenses thicken, amalgamate or die out.

show abstract

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Wave‐generated structures and sequences from a shallow marine succession, Lower Carboniferous, County Cork, Ireland

1977

View full text Add to dashboard Cite

show abstract

“…The pebbles and cobbles that litter this surface represent a terrestrial lag deposit. The phosphatic coatings that encrust this detritus (formerly 'Bolopora undosa') are problematic (Hoffman 1975). They may have an oncolitic or stromatolitic (cf.…”

Section: G Facies 7: Volcanicsmentioning

confidence: 99%

“…An original skeletal content may explain the decalcification (cf. Graham 1975). The coarser, compound crossbedded sandstones reflect deposition by migratory sand bodies in similar tidal environments (cJ Allen 1980).…”

Section: Facies 2: Tide-dominated Depositsmentioning

confidence: 99%

The arenig in South Wales: Sedimentary and volcanic processes during the initiation of a marginal basin

John-Joe

1988

Geological Journal

View full text Add to dashboard Cite

Marine clastic sediments and volcanics of Arenig (Ordovician) age crop out in South Wales. These were deposited after presumed late Tremadoc erosion and subsequent arc volcanicity. Arenig sedimentation was transgressive, and followed significant erosion of the arc volcanics. Arenig conglomerates, sandstones, and mudstones were deposited in deltaic and turbiditic systems. Storm and tidal processes influenced the shallow marine deposits. The minor rhyolitic volcanics extruded during the Arenig reflect the development of Ordovician marginal basin‐type volcanics across Wales. Five sandstone petrofacies are defined and reflect differing proportions of these volcanics and of Cambrian and Precambrian basement material. Sedimentation patterns were controlled by intra‐Arenig tectonism during an overall rise in sea level. Facies and petrofacies were ponded in small, interconnected, marine sub‐basins. Earliest Arenig tectonism and sedimentation, also recognized in North Wales, reflects the initiation of a marginal basin in Wales.

show abstract

“…Within the overall Tournaisian regional transgression, there were a number of subordinate episodes of rapid transgression punctuated by periods of relative still-stand (Graham, 1975;van Gelder & Clayton, 1978;MacCarthy & Gardiner, 1980;Gardiner & MacCarthy, 1981;Naylor et a/., 1983). Members 1 and 3 of the Kinsale Formation are mudrock units that extend over a broad region of southernmost Ireland (Jones, 1974;Gardiner & MacCarthy, 1981 ;Naylor ef at., 1983).…”

Section: Depositional Settingmentioning

confidence: 99%

Gravel‐topped offshore bar sequences in the Lower Carboniferous of southern Ireland

Cotter

1985

Sedimentology

View full text Add to dashboard Cite

Within the Kinsale Formation (Lower Carboniferous) of southern Ireland are pebbly sandstones and conglomerates contained in what is known locally as the Garryvoe conglomerate facies. In this facies there are three main groups of lithologies: (a) heterolithic mudrocks and sandstones characterized by a wide variety of wave‐produced structures; (b) sandstones dominated by swaley cross‐stratification (SCS), parallel lamination, and rare hummocky cross‐stratification (HCS); and (c) pebbly sandstones and conglomerates occurring as discrete beds or as gravel clasts dispersed through SCS sets. Successions of the facies comprise units of heterolithic mudrock and rippled sandstone alternating repeatedly with coarsening‐upward units of SCS pebbly sandstone capped by top‐surface granule and pebble lags. The Garryvoe conglomerate facies accumulated in a system of offshore bars on a muddy shallow‐marine shelf that was dominated by waves and currents generated by storms. Sands and gravels were bypassed from a contemporaneous northerly coastal zone to the shelf, where they were moulded by the storm‐generated flow into low, broad, sand ridges (offshore bars). The elongate bars were spaced kilometres apart, oriented obliquely to the coast, and separated by muddy interbar troughs. Their surfaces were largely covered by hummocky and swaley forms. Long‐term, gradual seaward migration of the offshore bars concentrated gravels on landward flanks from the dispersed pebbly sands that were on the crests and seaward flanks. Exceptionally intense storms could form laterally extensive winnowed gravel lags above thinned bar sequences. Such storms could also flush gravel‐bearing turbidity currents into muddy interbar trough areas.

show abstract

Analysis of an Upper Palaeozoic transgressive sequence in southwest County Cork, Eire

Cited by 15 publications

References 24 publications

Wave‐generated structures and sequences from a shallow marine succession, Lower Carboniferous, County Cork, Ireland

Wave‐generated structures and sequences from a shallow marine succession, Lower Carboniferous, County Cork, Ireland

The arenig in South Wales: Sedimentary and volcanic processes during the initiation of a marginal basin

Gravel‐topped offshore bar sequences in the Lower Carboniferous of southern Ireland

Contact Info

Product

Resources

About