 Shells of bivalves and aquatic snails are also common.The flora of the period has been revealed by fossils of green algae, fungi, mosses, horsetails, cycads, ginkgoes, and several families of conifers.Vegetation varied from river-lining forests of tree ferns, and ferns (gallery forests), to fern savannas with occasional trees such as the "Araucaria"-like conifer "Brachyphyllum".