Reply To: Found in a Silurian period hillside Homepage › Forums › What Is It? › Found in a Silurian period hillside › Reply To: Found in a Silurian period hillside January 5, 2021 at 11:59 am #93017 Bill DunlapParticipant Jim, thanks for your thoughts and suggestions. And for all the links! I’ll follow up. And, yes, I should use something to indicate scale when I take these field photos. Thanks.