Are these also mollusks ? Homepage › Forums › What Is It? › Are these also mollusks ? This topic has 3 replies, 2 voices, and was last updated 9 months, 1 week ago by Matthew Downing. Viewing 4 posts - 1 through 4 (of 4 total) Author Posts November 4, 2022 at 6:38 pm #136921 paul marsParticipant Likewise given to me when i was a kid. Attachments:You must be logged in to view attached files. November 4, 2022 at 10:47 pm #136926 Matthew DowningParticipant Hi Paul, Those are very nice mold/cast fossils of brachiopods, which superficially look like mollusks but belong to a different phylum. They have different symmetry and internal organs. Nice specimens! Matt November 6, 2022 at 2:27 pm #136998 paul marsParticipant How do fossils like this form? February 22, 2023 at 3:36 pm #144380 Matthew DowningParticipant The shells get buried in the mud and the shell often gets remineralized or altered. The mud hardens and often splits along bedding planes which have the fossilized shells in them. I’ve attached a plate of drawings of some common brachipods. Attachments:You must be logged in to view attached files. Author Posts Viewing 4 posts - 1 through 4 (of 4 total) You must be logged in to reply to this topic.