Abstract: This dataset contains clumped-isotope analyses of Cambrian and Ordovician bulk rock carbonate samples from Svalbard and Newfoundland, as well as Late Ordovician and Early Silurian brachiopod samples from Ohio and Gotland. This dataset accompanies the manuscript "A high-resolution record of early Paleozoic climate." Other Description: Goldberg, S.L., Present, T.M., Finnegan, S., Bergmann, K.D., 2020. A high-resolution record of early Paleozoic climate. Proceedings of the National Academy of Sciences of the United States of America