This volume explores geological boundaries in time and spaceusing palynology and micropalaeontology. Boundaries producedistinct signatures in the micropalaeontological record. Diffuseor sharp, gradual or abrupt, boundaries can tell us much aboutthe response of biotic systems to environmental change in bothmarine and terrestrial realms. Different microfossil groupsand geological contexts require their own approaches, definitionsand considerations of boundaries. The papers in this compilationcapture the current range of thinking on the methodology ofboundary identification from biostratigraphical, ecologicaland palaeoenvironmental perspectives. Contributions span theCambrian to Miocene and feature many fossil groups (includingpollen, dinoflagellates, foraminifera, ostracodes, conodonts,and diatoms). With a strong Canadian and North American focus,the volume also includes contributions from Poland, Egypt, Belgium,Argentina and the United Kingdom.