Female and male adult dog ticks.
Aka Rocky Mountain wood tick
Although i observed this tick today crawling on me, i may have acquired his company any time in the last 24 hours in my wanderings. Hence a large radius of occurrence drawn. The body length of this critter is about 1.5 mm; fortunately i found him before he started to burrow in me.
We each got a few passengers (no bites). Only encountered along the trails nearish Goat Camp.
Some black with a bit of red on the abdomen, some black with a thin white line either side of the abdomen. I think female & male, judging from some Googling.
The ticks along the rest of our route were all the brownish-reddish ones (and in *ridiculous* abundance along the slightly overgrown oak savannah portions of this trail. After getting a billion ticks on our pants we took a look at the bushes and discovered that the ends of them were COVERED IN TICKS. Seriously at least one tick per branch end, with its little legs held out for a ride).
Brief description of what you observed