Version history for Grain size, bulk density, and carbon content of sediment collected from Whale's Tail South marsh and adjacent bay floor, South San Francisco Bay, California, 2021-2022 (formerly cited as) Ferreira, J.C.T, McGill, S.C., Tan, A.C., Lacy, J.R., Grain size, bulk density, and carbon content of sediment collected from Whale's Tail South marsh and adjacent bay floor, South San Francisco Bay, California, 2021-2022, U.S. Geological Survey data release, https://doi.org/10.5066/P98BL0XF. (now cited as) Ferreira, J.C.T, McGill, S.C., Tan, A.C., Lacy, J.R., Grain size, bulk density, and carbon content of sediment collected from Whale's Tail South marsh and adjacent bay floor, South San Francisco Bay, California, 2021-2022 (ver. 2.0, March 2025): U.S. Geological Survey data release, https://doi.org/10.5066/P98BL0XF. ________________________________________________________ Version 1.0 posted online Aug. 22, 2023 ________________________________________________________ Version 2.0 revised and posted online March 11, 2025. Changes made in version 2.0: Data were revised to include two additional measurements, Shell_Subsample_Weight_g and NoShell_Subsample_Weight_g. No previously published data were changed.