Carboniferous of the Fintona Block, Northern Ireland - Revision history

Dbk at 11:10, 25 September 2017

2017-09-25T11:10:54Z

← Older revision		Revision as of 12:10, 25 September 2017
Line 36:		Line 36:
	<references/>		<references/>

	[[Category:Northern Ireland]]		[[Category:The geology of Northern Ireland]]

Dbk at 11:10, 25 September 2017

2017-09-25T11:10:29Z

← Older revision		Revision as of 12:10, 25 September 2017
Line 31:		Line 31:

	=== Slievebane Group [[Media:P947932.jpg\| (P947932)]] ===		=== Slievebane Group [[Media:P947932.jpg\| (P947932)]] ===
	The outcrop of this Group is fault-bounded [[Media:P947817.jpg\| (P947817)]] <ref name ="Mitchell1990"/>. At the best exposure [H 218 616] of the Tullanaglare Mudstone Formation at Tullanaglare, green mudstones contain miospore assemblages [[~~File~~:P948073.jpg\| (P948073) Fossils 7–10]] with index taxa of the RA and NJ biozones (Westphalian A/B). The Drumgivery Limestone Member marks the top of the formation. The Drumlish Conglomerate Formation is exposed [H 343 666] in Straduff Quarry [[Media:P947817.jpg\| (P947817)]], [[Media:P947998.jpg\| (P947998)]]. Volcanic rocks <ref name ="Mitchell1990"/> in the Omagh Thrust Fault zone [H 432 712] may be the source of the lava clasts in the conglomerate.		The outcrop of this Group is fault-bounded [[Media:P947817.jpg\| (P947817)]] <ref name ="Mitchell1990"/>. At the best exposure [H 218 616] of the Tullanaglare Mudstone Formation at Tullanaglare, green mudstones contain miospore assemblages [[Media:P948073.jpg\| (P948073) Fossils 7–10]] with index taxa of the RA and NJ biozones (Westphalian A/B). The Drumgivery Limestone Member marks the top of the formation. The Drumlish Conglomerate Formation is exposed [H 343 666] in Straduff Quarry [[Media:P947817.jpg\| (P947817)]], [[Media:P947998.jpg\| (P947998)]]. Volcanic rocks <ref name ="Mitchell1990"/> in the Omagh Thrust Fault zone [H 432 712] may be the source of the lava clasts in the conglomerate.

	==References==		==References==

Dbk at 11:10, 25 September 2017

2017-09-25T11:10:08Z

← Older revision		Revision as of 12:10, 25 September 2017
Line 24:		Line 24:
	=== Tempo-Lisbellaw Segment ===		=== Tempo-Lisbellaw Segment ===
	==== Kilskeery Group [[Media:P947931.jpg\| (P947931)]] ====		==== Kilskeery Group [[Media:P947931.jpg\| (P947931)]] ====
	Green mudstones near the top of the basal Topped Mountain Sandstone Formation exposed on the east flank of Brougher Mountain [H 355 531] contain miospores of the VF Biozone (Brigantian) including the index taxon ''Tripartites vetustus'' and ''Savitrisporites nux'' [[~~File~~:P948072.jpg\| (P948072) Fossils 4, 5]]. The hills of Largy, Ballyreagh and Brougher Mountain (316 m) are formed of the Ballyreagh Conglomerate Formation [[Media:P947817.jpg\| (P947817)]]. Interbedded sandstone and conglomerate occur in Largy quarry [H 298 475], ~~5km~~ west of Tempo and are associated with ripple marks and desiccation cracks. The Ballinamallard Mudstone Formation is exposed in the Ballinamallard River [H 268 529]. Miospores, recovered from green mudstones in the stream [[Media:P947817.jpg\| (P947817)]] at the Hollow House [H 251 552], include ''Reticulatisporites carnosus'' [[~~File~~:P948072.jpg\| (P948072) Fossil 6]] an index taxon of the NC Biozone [[Media:P947931.jpg\| (P947931)]].		Green mudstones near the top of the basal Topped Mountain Sandstone Formation exposed on the east flank of Brougher Mountain [H 355 531] contain miospores of the VF Biozone (Brigantian) including the index taxon ''Tripartites vetustus'' and ''Savitrisporites nux'' [[Media:P948072.jpg\| (P948072) Fossils 4, 5]]. The hills of Largy, Ballyreagh and Brougher Mountain (316 m) are formed of the Ballyreagh Conglomerate Formation [[Media:P947817.jpg\| (P947817)]]. Interbedded sandstone and conglomerate occur in Largy quarry [H 298 475], 5 km west of Tempo and are associated with ripple marks and desiccation cracks. The Ballinamallard Mudstone Formation is exposed in the Ballinamallard River [H 268 529]. Miospores, recovered from green mudstones in the stream [[Media:P947817.jpg\| (P947817)]] at the Hollow House [H 251 552], include ''Reticulatisporites carnosus'' [[Media:P948072.jpg\| (P948072) Fossil 6]] an index taxon of the NC Biozone [[Media:P947931.jpg\| (P947931)]].

	=== Milltown Segment ===		=== Milltown Segment ===

Dbk: 1 revision imported

2017-09-25T10:47:50Z

1 revision imported

← Older revision	Revision as of 11:47, 25 September 2017
(No difference)

Dbk at 15:22, 20 September 2017

2017-09-20T15:22:02Z

New page

__notoc__
{{nibrg}}
W I Mitchell

== Fintona Block ==
[[File:P947817.jpg|thumbnail|Geological map of the western part of the Fintona Block. (P947817)]]

[[File:P948072.jpg|thumbnail|Fossils 1–6 Early Carboniferous miospores: 1–3: (Courceyan and early Chadian) from the Roe Valley and Tyrone groups in Co. Londonderry. 1 Schopfites claviger (x 275) 2 Auroraspora macra (x 250) 3 Lycospora pusilla (x 625) 4–6: (Brigantian-Pendleian) from the Kilskeery Group in the Fintona Block, Co. Tyrone: 4 Tripartites vetustus (x 350) 5 Savitrisporites nux (x 300) 6 Reticulatisporites carnosus (x 225) (P948072) ]]

[[File:P948073.jpg|thumbnail|Fossils 7–10 Late Carboniferous (Westphalian A-B) miospores from the Slievebane Group in the Fintona Block, Co. Tyrone: 7 Dictyotriletes bireticulatus (x 550) 8 Laevigatosporites desmoinesensis (x 550) 9 Endosporites globiformis (x 400) 10 Vestispora pseudoreticulata (x 500) (P948073) ]]

[[File:P947931.jpg|thumbnail|Litho-, bio- and chronostratigraphy of the Kilskeery Group of the Fintona Block. (P947931)]]

[[File:P947927.jpg|thumbnail|Distribution and classification of Carboniferous rocks in Northern Ireland. (P947927)]]

[[File:P947818.jpg|thumbnail|Location (A) and detailed geological map (B) of the stratotype of the Greenan Sandstone Formation. (P947818)]]

[[File:P947932.jpg|thumbnail|Litho-, bio- and chronostratigraphy of the Slievebane Group of the Fintona Block. (P947932)]]

[[File:P947998.jpg|thumbnail|The Drumlish Conglomerate Formation, Straduff quarry [H 343 666], Co. Tyrone, 16 km ENE of Kesh. Vertical bedding, youngs to the right. (P947998)]]

The Carboniferous rocks are restricted <ref name ="Mitchell1990">Mitchell, W I, and Owens, B. 1990. The geology of the western part of the Fintona Block, Northern Ireland-evolution of Carboniferous basins. ''Geological Magazine'', 127, 407 26.</ref> to the fault-bounded and lithostratigraphically distinctive Milltown and Tempo-Lisbellaw segments [[Media:P947817.jpg| (P947817) ]]<ref>Geological Survey of Northern Ireland 1982. Enniskillen, Northern Ireland Sheet 45. Solid Geology. 1:50 000. (Southampton: Ordnance Survey for the Geological Survey of Northern Ireland).</ref><ref>Geological Survey of Northern Ireland 1995. Omagh, Northern Ireland Sheet 33. Solid Geology. 1:50 000. (Keyworth, Nottingham: British Geological Survey).</ref>.

=== Tempo-Lisbellaw Segment ===
==== Kilskeery Group [[Media:P947931.jpg| (P947931)]] ====
Green mudstones near the top of the basal Topped Mountain Sandstone Formation exposed on the east flank of Brougher Mountain [H 355 531] contain miospores of the VF Biozone (Brigantian) including the index taxon ''Tripartites vetustus'' and ''Savitrisporites nux'' [[File:P948072.jpg| (P948072) Fossils 4, 5]]. The hills of Largy, Ballyreagh and Brougher Mountain (316 m) are formed of the Ballyreagh Conglomerate Formation [[Media:P947817.jpg| (P947817)]]. Interbedded sandstone and conglomerate occur in Largy quarry [H 298 475], 5km west of Tempo and are associated with ripple marks and desiccation cracks. The Ballinamallard Mudstone Formation is exposed in the Ballinamallard River [H 268 529]. Miospores, recovered from green mudstones in the stream [[Media:P947817.jpg| (P947817)]] at the Hollow House [H 251 552], include ''Reticulatisporites carnosus'' [[File:P948072.jpg| (P948072) Fossil 6]] an index taxon of the NC Biozone [[Media:P947931.jpg| (P947931)]].

=== Milltown Segment ===
==== Greenan Sandstone Formation [[Media:P947927.jpg| (P947927)]] ====
The basal unconformity with the Dalradian is exposed [H 316 668] on Greenan Mountain [[Media:P947817.jpg| (P947817)]] and [[Media:P947818.jpg| (P947818) ]]. Green mudstone laminae in the sandstone contains miospores diagnostic of the VF and possibly NC biozones. Rhyolitic lava occurs towards the top of the Formation east of Omagh.

=== Slievebane Group [[Media:P947932.jpg| (P947932)]] ===
The outcrop of this Group is fault-bounded [[Media:P947817.jpg| (P947817)]] <ref name ="Mitchell1990"/>. At the best exposure [H 218 616] of the Tullanaglare Mudstone Formation at Tullanaglare, green mudstones contain miospore assemblages [[File:P948073.jpg| (P948073) Fossils 7–10]] with index taxa of the RA and NJ biozones (Westphalian A/B). The Drumgivery Limestone Member marks the top of the formation. The Drumlish Conglomerate Formation is exposed [H 343 666] in Straduff Quarry [[Media:P947817.jpg| (P947817)]], [[Media:P947998.jpg| (P947998)]]. Volcanic rocks <ref name ="Mitchell1990"/> in the Omagh Thrust Fault zone [H 432 712] may be the source of the lava clasts in the conglomerate.

==References==
<references/>

[[Category:Northern Ireland]]