My usual entrance into O'Neill park has a new name*. I was running (OK, walking) up a steep hill when I spotted a bone fragment embedded right in the trail. There were several small pieces nearby, which was not surprising given the amount of hiking and mountain bike traffic.
For those who are interested, this is an outcropping of the Oso Sand member of the Capistrano Formation. So the bone is 10 to 4.5 million years old, which puts it in the Late Miocene to Early Pliocene timeframe.
*Formerly known as "Broken Arm Trail" in honor of my son's mountain bike accident there about six years ago.
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