Coralomorph (Amsassia colonies) in thrombolite mounds. Amsassia intpreted as calcareous green alga by Lee et al. (2021).
Stromatolites, and particularly thrombolites, are ubiquitous and very common components of the higher-frequency cycles.  Calcarenites are mainly composed of peloids, well-rounded intraclasts, aggregate lime grains, micritized ooids, and a few bioclasts. Bioclasts are very scarce and include rare calcareous algae such as Nuia sp. and scattered fragments of gastropods, trilobites, and nautiloids within the cross-bedded subtidal grainstone-packstone intervals.  Abundant in situ gastropods seem intimately related with domical thrombolites.