these are the other rocks I found near Lake Ontario
closed as off-topic by Universal_learner, Peter Jansson, Jan Doggen, arkaia, Fred Jul 13 at 17:18
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Please review our rock identification guidelines to provide the missing information so that your question is both answerable and useful to new users." – Universal_learner, Peter Jansson, Jan Doggen, arkaia, Fred
Your rock contains crinoid stems and coral fossils. The circular shape with star pattern is a cross sectional view of a crinoid stem. This patterns gives the fossil the nick name of 'star crinoid'.