The Silurian of North Galway and South Mayo

Graham, John R.; Dewey, John; Ryan, Paul D.

doi:10.1007/978-3-030-97479-4_8

Cited by 1 publication

(6 citation statements)

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“…Erosion in the southern SMT, following 'late Caledonian' deformation, makes it difficult to decipher the nature of earlier deformation. The only clear relationships are those between the southern SMT volcanic successions, Rosroe Formation and the Silurian in Joyce Country, which is a highly angular unconformity (Graham et al 1989). There are no localities where the relationship between the Ordovician Glenummera and Mweelrea formations and KHJCs Silurian can be demonstrated.…”

Section: Sub-silurian Unconformity Across the Smtmentioning

confidence: 91%

“…In the northern SMT in the Croagh Patrick syncline, the sSu is overlain a Silurian clastic marine succession (Graham et al 1989), which, following faunal reassessment by Williams and Harper (1991), is of presumed Llandovery age but which remains imprecisely dated. While disrupted by later deformation, the cryptic pattern of Ordovician stratigraphy truncated beneath the sSu that occurs in the Croagh Patrick syncline has the characteristics of a planated hanging-wall inversion structure (e.g.…”

Section: Sub-silurian Unconformity Across the Smtmentioning

confidence: 99%

“…The Silurian succession in the studied area (Fig. 4) has recently been summarised by Graham (2021) and , so only a brief summary is given here. It records the passage from terrestrial sedimentation above the sSu, through to fluvial deposition (Lough Mask Formation), to marine conditions (Kilbride and Tonalee formations), turbidite deposition (Lettergesh Formation) succeeded by a more regressive regime where sediment supply kept pace with subsidence (Glencraff, Lough Muck and Salrock formations).…”

Section: Stratigraphy Of the Khjcs And Evidence For Synsedimentary Fa...mentioning

confidence: 99%

“…The Derry Bay Fault (Graham et al 1989) is a major structure with a largely Ordovician history that has not previously been described in detail. It can be followed from Derry Bay westwards towards the coast.…”

Section: Introductionmentioning

confidence: 99%

“…The fault does not continue eastwards along Derry Bay as the outcrop of the Silurian is unaffected across the bay at the eastern end. Instead, movement transfers northwards via the Lettereeneen Fault (McManus 1987;Graham et al 1989) into the Erriff Valley Fault zone (Bohaun shear zone). A detailed account of the history of this particular fault is being prepared by the authors.…”

Section: Introductionmentioning

confidence: 99%

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Structural control of the deposition and subsequent deformation of the Killary Habour-Joyce Country Silurian succession

Badley,

Graham,

Leake

2024

ijes

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The Killary Harbour–Joyce Country succession of Silurian rocks forms the remnant of one of three successor basins that developed after the Grampian Orogeny and which are preserved in western Ireland. Its outcrop everywhere obscures the contact between the Dalradian rocks of Connemara and the Ordovician rocks of the South Mayo Trough. The outcrop is bisected by the prominent north-west trending Maam Valley Fault Zone that is shown to have a component of synsedimentary movement down-throwing to the southwest. The original basin margins lay well outside the current outcrop area. North-south shortening and inversion of the basin was accomplished by reactivation and inversion of earlier fault structures and was exclusively in the brittle zone. Folding of the Silurian rocks with weak to moderate cleavage and deformation of the basement rocks of Connemara was accomplished by largely vertical movements along numerous strike parallel and oblique fractures. Break-back inversion structures were developed along the southern margin of the South Mayo Trough, which include thrusting associated with footwall shortcut faults and clockwise rotation. Although the timing of deformation overlaps that of diorite sill emplacement, it remains poorly constrained in absolute terms.

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Section: Sub-silurian Unconformity Across the Smtmentioning

confidence: 91%

Section: Sub-silurian Unconformity Across the Smtmentioning

confidence: 99%

Section: Stratigraphy Of the Khjcs And Evidence For Synsedimentary Fa...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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