Burr Oak leaves in fall

I decided to call in at Stanley Park, Calgary, late this afternoon and found that there were still some pretty fall colours around, even though fall is almost over now. These leaves are on a Burr Oak tree. A few weeks ago, the leaves were vivid yellow with red veins, but have now turned a mixture of orange, pink and green. They are some of my favourite leaves - a very unique shape, narrowing dramatically closer to the stem end of each leaf.