A note from APGOEF:  Today we are publishing something a bit different than our regular blog posts! It is our primary goal at APGOEF to educate and spread awareness about geoscience, so when Ken Lyon presented us with this comprehensive list of resources, we couldn’t resist sharing it with our readers. We hope you will find this compilation useful to your exploration of earth science. APGOEF does not take responsibility for the content of the resources provided, and cannot vouch for their validity. Preface The following is written by: Ken Lyon, MSc, P.Geo, kenlyongeo@gmail.com, Peterborough, ON The impetus for this compilation of over 50 publications and internet resources came from Laura Mancini of the Ontario Geological Survey. Laura reached out to me in 2021 in my capacity as Newsletter Editor of the Kawartha Rock and Fossil Club. She had been contacted by someone who was looking to explore the geology of Ontario, and wondered if the Kawartha club might have something to help. Laura’s question fit in with a list of resources that I had started compiling for rockhounds, field naturalists and other people who like these kinds of things. Perhaps now more than ever with climate change and related issues front-and-centre, we are coming to appreciate that geoscience is hugely significant and fun to learn about and explore. In compiling this list, I have tried to offer some guidance by assigning levels to the resources ranging from Level 1 for those who know nothing or little about geology to Level 3 for those who feel comfortable with basic concepts. Resources marked with a * are particularly recommended. I have included some of my favourite books that cost money and also many good resources that are free of charge. Level 3 and beyond takes you into the worlds of serious mineral, rock and fossil collectors and people who have taken college and university courses. This is not to say that you need formal study. I am constantly learning from members of the Kawartha and other clubs who are self-taught and know more about some topics than I ever will. This compilation is a work-in-progress and I have made some minor revisions since 2021. Hopefully, you will find a few “nuggets” of information to help you get out and have some fun. Amethyst rock from Thunder Bay area, ON. Photo: Ken Lyon Amethyst is a purple variety of quartz and the official gemstone of Ontario. The reddish-brown crystals on the left are amethyst crystals coated with the iron mineral, hematite. The length of the rock shown is 40 cm. My wife bought this as a treasured addition to her rock garden. Acknowledgements While I take responsibility for selection of the resource list and comments, I would like to gratefully acknowledge review comments and encouragement provided by the following in alphabetical order: Andy Fyon, PhD, formerly of the Ontario Geological Survey; Kevin Kidd of the Kawartha Rock and Fossil Club and the Gem and Mineral Club of Scarborough; Laura Mancini, MSc, PGeo, of the Ontario Geological Survey; Bill Pearson, PhD, PGeo, and Deana Schwarz, PhD, PGeo, of the APGO Education Foundation; and Ashley Pollock of the London Gem, Mineral and Fossil Society, the Walker Mineralogical Club, and the Central Canadian Federation of Mineralogical Societies (CCFMS) Some Important Precautions and Disclaimers You are responsible for knowing where you can go, where you can park, what safety hazards may exist and what personal protective equipment you need, and what you can pick up and take back home. Parking rules change from road to road and place to place.  Respect all laws and rights governing private and Crown property, and obey all rules and regulations covering any access to and from any of locations. Bedrock outcrops and other locations can pose traffic, slip-trip-fall and other hazards. The use of hammers can be dangerous and in some cases destroys the outcrop for future observation. Rock, mineral and fossil samples cannot be removed from protected areas such as parks and conservation areas or from private property without permission. If you are rockhounding, please follow the CCFMS Code of Ethics for Rockhounds (https://ccfms.ca/Copied_Field_Trips.php) and Safety for Field Trippers (https://ccfms.ca/CCFMS-Safety-Rules.php). I have not personally visited most of the sites listed and cannot vouch for the accuracy of the content of the resources. And finally, I have to disclaim any liability in connection with the use of the information presented and my annotated comments and recommendations. Great Unconformity bedrock outcrop at Galesburg just northeast of Peterborough in The Land Between. Photo: Ken Lyon Paleozoic Ordovician limestone about 450 million years old overlying Precambrian granitic mountain core about 1 billion years old; incredible time spans. Annotated List Alphabetically by Author (or source when no author is available) Resources marked * are particularly recommended. Level 1 Resources Brachiopod and bryozoa fossils in limestone near Lindsay, ON. Photo: Don McLeod used with permission. Don maintains a good nature blog at https://www.donaldmcleod.com Fossiliferous Ordovician limestone about 450 million years old. At the time we were under a warm shallow sea south of the equator. The large fossil is about 3 cm across. Other Museums, Science Centres, Geo-Parks There are many museums and other facilities across southern Ontario that feature geology exhibits. Here are a few that were recommended by my reviewers: Arkona Lions Museum –  Arkona, ON Bancroft Mineral and Mining Museum, Bancroft, ON Canadian Museum of Nature, Ottawa, ON Hooper Virtual Natural History Museum – Carleton University, Ottawa, ON Metcalfe Geoheritage Park – Almonte  Miller Museum of Geology, Queens University, Kingston, ON Oil Museum of Canada, Oil Springs, ON Science North – Sudbury, ON Additional Fossil Resources Some additional fossil references recommended by my reviewers are listed below: Level 2 Resources Physiographic features of the Peterborough – Stoney Lake, ON area. Small portion of Physiography of the South Central Portion of Southern Ontario. Ont. Dept. of Mines and Northern Affairs, Map 2226. Scale 1:253,440. © Queen’s Printer for Ontario 1972. Reprinted 1984 with minor revisions. Features shown include till moraine (purple), sand plains