Two outcrop sections (Tangwangzhai and Laopozhuang sections, about 20 km distant) in Shandong Province. Microbial components comprise microstromatolites, calcified Girvanella filaments, and Renalcis-like botryoid forms. Microstromatolites, which are one of the most common components of the maze-like structures, mostly exhibit convex-up laminae composed of alternating micrite and microsparite