Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The publication of this short Memoir completes the geological descriptions of the area directly bordering the Estuary of the Thames, and may be looked upon as supplementary to Mr. Whitaker's longer Memoir on The Geology op the London Basin, 1872.<br><br>I look upon the preservation of the well sections as of very great value.