This database comprises field notebooks reporting geological field work associated with NERC Standard Grant NE/R001324/1 from 1/10/2017 – 30/6/2021. The fieldwork involved examination of Ordovician – Devonian sequences from North Wales and Scotland. Samples were collected for palynological analysis. Palynological processing involves the recovery of organic-walled microfossils by hydrochloric and hydrofluoric acid maceration. Details of other non-NERC-funded fieldwork undertaken during this period is included in the field notebooks.