Constraints on the significance of the Orlock Bridge Fault within the Scottish Southern Uplands: A discussion of “The Orlock Bridge Fault: a major Late Caledonian sinistral fault in the Southern Uplands terrane, British Isles” by T. B. Anderson and G. J. H. Oliver

In their account of the Orlock Bridge Fault of Northern Ireland and its presumed continuation into the Scottish Southern Uplands (the Kingledores Fault) Anderson and Oliver (1986) provide welcome detail in support of major strike-slip movement. However, their identification of the Kingledores Fault as a line of massive strike-slip movement is based on a number of assumptions which are permissible only because biostratigraphical control is generally sparse. In particular the assertion that the Kingledores Fault is a “giant step in the diachronous southerly ascent of the turbidite base” is founded largely on a misinterpretation of evidence recorded by Peach and Horne (1899), Griffith and Wilson (1982) and others.

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The North Greenland fold belt in eastern Nansen Land

Rapport Grønlands Geologiske Undersøgelse ◽

10.34194/rapggu.v126.7912 ◽

1985 ◽

Vol 126 ◽

pp. 69-78

Author(s):

J.D Friderichsen ◽

H.-J Bengaard

Keyword(s):

Lower Cambrian ◽

Upper Cretaceous ◽

Field Work ◽

Strike Slip ◽

Fold Belt ◽

Clastic Rocks ◽

The North ◽

Major Strike ◽

East West ◽

Strike Slip Movement

Field work in 1984 shows that Nansen Land consists of clastic rocks of the carbonaceous Paradisfjeld Group and terrigeneous rocks of the Polkorridoren Group; both are lower Cambrian in age and deposited in a slope and fan environment. Two major Ellesmerian (Devonian to Carboniferous) phases of deformation gave rise to east-west trending folds and schistosities. Three phases of Eurekan (upper Cretaceous to Tertiary) deformation, associated with dyke intrusion, are recognised. The second of these may be related to transpression on the Harder Fjord fault zone, though no major strike-slip movement seems to have taken place.

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Kilbuchophyllid corals from the Ordovician (Caradoc) of Pomeroy, Co. Tyrone: implications for coral phylogeny and for movement on the Southern Uplands Fault

Transactions of the Royal Society of Edinburgh Earth Sciences ◽

10.1017/s0263593300006891 ◽

1997 ◽

Vol 88 (3) ◽

pp. 117-126 ◽

Cited By ~ 10

Author(s):

Colin T. Scrutton ◽

Andrew J. Jeram ◽

Howard A. Armstrong

Keyword(s):

Northern Ireland ◽

Strike Slip ◽

Scleractinian Corals ◽

Rich Fauna ◽

Strike Slip Movement

AbstractAn excavation in the mid-Ordovician (Caradoc) Bardahessiagh Formation at Pomeroy, Co. Tyrone, Northern Ireland in 1992 has yielded a rich fauna of invertebrates, including several specimens of the scleractiniamorph coralKilbuchophyllia. The material is assigned to the speciesK. clarksoni, previously described from penecontemporaneous levels in the Kirkcolm Formation of the Northern Belt of the Southern Uplands. The diagnosis ofK. clarksoniis extended to include specimens of significantly greater size than the Southern Uplands material. All the material is mouldic but includes composite moulds, which in comparison with the preservation of other faunal elements, strongly suggests an original aragonitic composition for the kilbuchophyllid skeleton. Furthermore, details of insertion of higher cycles of septa visible on one particularly well preserved specimen confirm the process of septal substitution in these corals. Septal substitution is otherwise unique to post-Palaeozoic scleractinian corals and indicates the presence of paired mesenteries in the kilbuchophyllid polyp. The significance of this for the evolution of these corals and related anemones is discussed. The discovery of kilbuchophyllid corals at Pomeroy supports the view that post-Caradoc sinistral strike-slip movement on the Southern Uplands Fault was unlikely to have exceeded 200 km.

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Possible earthquake-induced soft-sediment faulting and remobilization in Pennsylvanian alluvial strata, southern New Brunswick, Canada

Canadian Journal of Earth Sciences ◽

10.1139/e85-094 ◽

1985 ◽

Vol 22 (6) ◽

pp. 907-912 ◽

Cited By ~ 30

Author(s):

A. G. Plint

Keyword(s):

New Brunswick ◽

Lake Sediments ◽

Strike Slip ◽

Soft Sediment ◽

Braided River ◽

The North ◽

Playa Lake ◽

Different Depths ◽

Major Strike ◽

Strike Slip Movement

Braided river, sheetflood, and playa lake sediments of the Tynemouth Creek Formation (Lower Pennsylvanian) show superficial synsedimentary faulting and subsurface post-depositional sediment remobilization. A prominent palaeosol has been offset 90 cm on two faults, movement on which clearly preceded deposition of the overlying beds. Seventeen to 25 m below this horizon, large load structures, upward-branching siltstone intrusions, and three types of sandstone dike are recognised. Intrusion occurred on several occasions at different depths of burial and was the result of rapid, probably earthquake-induced dewatering. This interpretation is supported by the location of the study area, only a few kilometres to the north of the Cobequid–Chedabucto Fault, on which major strike-slip movement occurred during the Pennsylvanian.

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Spore assemblages from the Lower Devonian ‘Lower Old Red Sandstone’ deposits of the Northern Highlands of Scotland: the Berriedale Outlier

Earth and Environmental Science Transactions of the Royal Society of Edinburgh ◽

10.1017/s1755691015000055 ◽

2014 ◽

Vol 105 (3) ◽

pp. 227-238 ◽

Cited By ~ 2

Author(s):

Charles H. Wellman

Keyword(s):

Large Scale ◽

Lower Devonian ◽

Strike Slip ◽

Fault System ◽

British Isles ◽

Early Devonian ◽

Red Sandstone ◽

Orcadian Basin ◽

Strike Slip Movement ◽

Northern Highlands

ABSTRACTAssemblages of well-preserved dispersed spores have been recovered from the ‘Lower Old Red Sandstone’ deposits of the Berriedale Outlier in the Northern Highlands of Scotland. They belong to the annulatus–sextantii Spore Assemblage Biozone (AS SAB), in the spore zonation of Richardson & McGregor (1986), indicating an Early Devonian Emsian (but not earliest Emsian or latest Emsian) age. Comparison with the spore zonation of Streel et al. (1987) suggests they may be confined to the annulatus–bellatulus Oppel Zone (AB OZ), further constraining the age to early Emsian. This new biostratigraphical datum provides an age constraint for the onset of ‘Lower Old Red Sandstone’ sedimentation in the Orcadian Basin and, in particular, northwest of the Great Glen Fault System on the Northern Highlands. In the Orcadian Basin, there is a gap between ‘Lower Old Red Sandstone’ and ‘Middle Old Red Sandstone’ sedimentation, represented by either unconformity or disconformity, which appears to be variable in duration. In the Berriedale Outlier, it is estimated to represent up to 16 million years, but with an unknown thickness of ‘Lower Old Red Sandstone’ sequence removed at the unconformity. However, this basin-wide unconformity/disconformity is likely due to minor, local rather than large-scale, regional tectonism, and the evidence suggests little, if any, syn-depositional strike-slip movement along the Great Glen Fault System during Devonian ‘Old Red Sandstone’ deposition. The described spore assemblage is the most diverse AS SAB/AB OZ assemblage described from the British Isles. However, compared to contemporary spore assemblages from elsewhere on the Old Red Sandstone continent, the Scottish material is rather depauperate, with certain key taxa absent. This probably reflects subtle ecological effects, with the Scottish material representing restricted floras of the inland intermontaine basins.

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A second Irish record of Limnephilus borealis (Zetterstedt, 1840) (Trichoptera: Limnephilidae) from Northern Ireland

The Entomologist s monthly magazine ◽

10.31184/m00138908.1542.3926 ◽

2018 ◽

Vol 154 (2) ◽

pp. 125-128

Author(s):

James P. O'Connor ◽

Cathal McNaughton

Keyword(s):

Northern Ireland ◽

British Isles

The discovery of the caddisfly Limnephilus borealis at a second site in Northern Ireland strongly suggests that the species is an established native. Within the British Isles L. borealis was previously known only from Scotland.

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