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Earth Science Conservation Review
| Lurganboy - site of local interest | Tyrone |
| Site number: | 738 | ||
| Locality Type: | Inland exposure, Pit | Status: | local interest |
| Grid Reference: | H590644,H586660,H605675 Corners of site | ||
| Google maps: | 54.52499,-7.08877 | ||
| County: | Tyrone | Council area: | Fermanagh & Omagh District Council |
| Period: | Quaternary | ||
| Site Description | |
|---|---|
| Highlights: | |
The area around Lurganboy is characterised by largely undissected flat surfaces of deltaic and associated outwash sediments, extending from the northern limit of the dissected deposits near Altamooskan [H590 644] and Fallaghearn to the area around Foremass [H586 660] and Bernisk Glen [H605 675] where ridge morphologies dominate. | |
| Description: | |
The area around Lurganboy is characterised by largely undissected flat surfaces of deltaic and associated outwash sediments, extending from the northern limit of the dissected deposits near Altamooskan [H590 644] and Fallaghearn to the area around Foremass [H586 660] and Bernisk Glen [H605 675] where ridge morphologies dominate. This area of outwash is about 2.5km x 4km in extent and meltwater channels are relatively few in number, often wide and with postglacial infills. As a result continuous flat surfaces are preserved. There are generally few exposures though one large pit at Lurganboy, 7km southeast of Sixmilecross, is characterised by generally poorly-sorted stacked facies of clast and matrix-supported gravel interbedded with massive and stratified well-sorted medium- and coarse-grained sand. Generally the sand beds are laterally discontinuous and have graded contacts. | |
| Importance: | |
The site is scientifically important as it contains good examples of largely undissected flat surfaces of deltaic and associated outwash sediments. | |
| Interpretation: | |
The sediment sequences exposed in Lurganboy record the deposition of material provided and regulated by the input of sediment pulses into a subaqueous environment. An upsequence change in depositional direction and increase in interbedding and channelisation is due to water shallowing and local flow events emanating from adjacent high ground. This may be associated with a change from a deltaic to an outwash depositional setting at 195-200m O.D. | |
| Notes: | |
See also ESCR Key Site 492 - Ballygawley Delta Complex - Lurganboy Delta and Outwash [Sand and Gravel Landscapes Block]. | |
| Keywords | |
|---|---|
| Rocks: | Gravel, Sand |
| Relations: | Subaqueous outwash |
| Geomorph: | flat-topped delta, outwash terrace |
| Paleoenv: | glacial |
| Measurements | |||||
|---|---|---|---|---|---|
| Length: | Width: | Height: | |||
| Depth: | Area: | ~10km2 | |||
| Access | |
|---|---|
| Approach: | This site is located approximately 7km southeast of Sixmilecross. |
| Uses | |
| Educ. Level: | The site is of educational value to researchers and students of glaciology. |
| Record type: | SLNCI Report | ||
| Entered by: | E M Porter | ||
| Last updated: | 09/10/03 | ||
| Enlander, I., Dempster, M. & Doughty, P., 2026. Lurganboy - site of local interest, County Tyrone, site details. [In] Earth Science Conservation Review. https://www.habitas.org.uk/escr/site.php?item=738. Accessed on 2026-11-06. |
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