High-resolution Annotated Dataset of Girvanella Boundstone Microfacies from the Xiannüdong Formation, China

The calcimicrobial crust-cement boundstone in the Xiannüdong Formation of the Cambrian Series 2 is a distinctive reef type that reflects the evolution of late Precambrian stromatolite structures. This study provides a high-resolution dataset by segmenting large slab images of Girvanella-based reefs into 114 × 114 pixel tiles and annotating microfacies components through a point-counting-based automated labeling.The dataset includes PNG images and corresponding CSV files and can be used as training data for deep learning-based classification of carbonate microfacies. It contributes to research on the evolution of ancient marine ecosystems and the structure of early carbonate platforms.