This study investigates the carbon emissions associated with large igneous province (LIP) eruptions during the Early Jurassic period, using high-resolution sedimentary mercury data from the Llanbedr (Mochras Farm) borehole in Wales. The authors aim to quantify LIP degassing over a 20-million-year interval (195-175 million years ago) by analyzing mercury concentrations in sediments. They find that elevated mercury levels coincide with significant carbon-cycle changes, including the Toarcian Oceanic Anoxic Event (TOAE) (183-182 million years ago). By estimating excess mercury loading, they calculate carbon emissions from LIP activity, suggesting that multi-millennial episodes of volcanic activity likely drove increases in pCO2 and temperature. However, these emissions are lower than those predicted by carbon-cycle models, indicating the need for further investigation into climate-carbon cycle feedbacks or other co-emitted gases. The study demonstrates the utility of mercury records in quantifying past carbon fluxes and highlights the importance of considering complex feedback processes in understanding Earth system responses to LIP events.This study investigates the carbon emissions associated with large igneous province (LIP) eruptions during the Early Jurassic period, using high-resolution sedimentary mercury data from the Llanbedr (Mochras Farm) borehole in Wales. The authors aim to quantify LIP degassing over a 20-million-year interval (195-175 million years ago) by analyzing mercury concentrations in sediments. They find that elevated mercury levels coincide with significant carbon-cycle changes, including the Toarcian Oceanic Anoxic Event (TOAE) (183-182 million years ago). By estimating excess mercury loading, they calculate carbon emissions from LIP activity, suggesting that multi-millennial episodes of volcanic activity likely drove increases in pCO2 and temperature. However, these emissions are lower than those predicted by carbon-cycle models, indicating the need for further investigation into climate-carbon cycle feedbacks or other co-emitted gases. The study demonstrates the utility of mercury records in quantifying past carbon fluxes and highlights the importance of considering complex feedback processes in understanding Earth system responses to LIP events.