# Berthin Brook

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The '''Berthin Brook''' is a minor right bank tributary of the [River Usk](/source/River_Usk) in [Monmouthshire](/source/Monmouthshire), in south [Wales](/source/Wales). Flowing north from [New Inn](/source/New_Inn) initially,<ref>{{Cite book|last=|first=|title=Proceedings {{!}} Volume 19|publisher=Cotteswold Naturalists' Field Club|year=1918|isbn=|location=|pages=131–133}}</ref> it turns east at [Little Mill](/source/Little_Mill%2C_Monmouthshire) to flow along a former [glacial meltwater channel](/source/glacial_meltwater_channel) past the former [Royal Ordnance Factory](/source/Royal_Ordnance_Factory) site (now BAE Systems) at [Glascoed](/source/Glascoed) and by Rhadyr to join the major river 1&nbsp;km north of the town of [Usk](/source/Usk). At the height of the [last ice age](/source/Last_Glacial_Period) (the Devensian), the Usk valley glacier reached as far down the Usk valley as Little Mill and sediment-laden meltwater created a valley [sandur](/source/Outwash_plain) over which the post-glacial Berthin Brook now flows.<ref>{{cite book |last1=Lewis |first1=Colin A. |last2=Richards |first2=Andrew E. |title=The glaciations of Wales and adjacent areas |date=2005 |publisher=Logaston Press |location=Little Logaston, Herefordshire |isbn=1904396364 |pages=117–119 |edition=First}}</ref>

== References ==
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Category:Rivers of Monmouthshire

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