Abstract

Characterisation of gravel deposits in the pre-glacial channel, Central Dublin

Highlights

  • From a geotechnical engineer’s perspective, Dublin City and environs are well known for their flooring in a thick competent glacial diamict, representing a sequence of lodgement tills

  • Geology in the area typically consists of the pre-glacial channel, which is cut into the Carboniferous (Lucan Formation) limestone bedrock, an intermittent lower glacial till, a large fluvio-glacial sand and gravel deposit and an intermittent upper glacial till

  • Data gathering A full description of the process of data gathering, borehole selection and data synthesis is given by Kealy (2017) and is summarised as follows: Most of the borehole data used was taken from prior site investigations related to the MetroLink, the Luas and Dublin Light Rail, as provided by Transport Infrastructure Ireland (TII)

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Summary

Introduction

From a geotechnical engineer’s perspective, Dublin City and environs are well known for their flooring in a thick competent glacial diamict, representing a sequence of lodgement tills (colloquially known as ‘Dublin Boulder Clay’). A significant geological feature underlying the city is a buried pre-glacial channel north of the River Liffey (Farrington 1929; Hoare 1976; Naylor 1965) This feature is thought to be up to 45m deep and is infilled mostly with water bearing fluvio-glacial gravels of variable consistency (O’Connor et al 2020). Bedrock geology The bedrock underlying the study area in Dublin City consists of the Lucan Formation, which is composed of interbedded dark argillaceous limestones and shales of Viséan (Mississippian) age (e.g. Sevastopulo and Wyse Jackson 2009). This unit has been termed ‘Calp Limestone’ The most consistently applicable model is of a last ice flow from inland sources (upper inland tills and striae) with a preceding onshore (ISB) flow reworking marine muds and shell fragments (the wellknown Irish Sea Till; e.g. Ó Cofaigh and Evans 2007)

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