Overaperiodofthirtyyearshemademajorcontributionstogeology,particularlyhisinvestigationoffossilremainswhichconvincedhimthatmajorchangeshadoccurredintheEarth'ssurfacewhichhadliftedfossilisedshellsofmarineanimalstohighpointsinmountainranges.
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Over a period of thirty years he made major contributions to geology, particularly his investigation of fossil remains which convinced him that major changes had occurred in the Earth's surface which had lifted fossilised shells of marine animals to high points in mountain ranges.