Andrew MacRae used to be very active on talk.origins. At the time he was studying Burgess Shale fossils and his expertise was much appreciated. He earned the nickname "Saint" Andrew because he was kind to, and patient with, most creationists. Many of us weren't.
Andrew was also interested in "Polystrate" Tree Fossils because creationists often used them as "proofs" that evolution is wrong.
Here's Andrew extracting a fossil tree from the Joggin Fossil Site in Nova Scotia (Canada). He looked a bit younger when I last saw him in Toronto in 1998.