The file includes three images of a carbonate rock sample: two 3D micro-CT scans of the carbonate at resolutions of 3 micrometers and 1 micrometer, and one 2D SEM image of the rock surface with a resolution of 100 nanometers. The Python scripts include the network architecture of the cascading SR model, along with the training and testing processes. For using the code or the datasets, please cite the following paper: Tang, K., Wang, Y. D., Regaieg, M., Benoual, I., Armstrong, R. T., & Mostaghimi, P. (2025). Unlocking Sub-Micrometer Features in Carbonate Rocks: A Cascading Super-Resolution Approach for Multiscale Multi-Instrument Carbonate Characterization. Water Resources Research, 61(8), e2025WR040865. https://doi.org/10.1029/2025WR040865