Stuart Charles Law:
Very quickly, as has happened once quite a while back, i was into the "Beautiful Breath" .... Well before the first bell, so i would say 7 to 10 minutes into my sit i was in a place of delicious concentration very easy to be in, and any time it felt, or was under attack it was just a matter of going back to the breath and resharpening the thing ... so all in all a nice place to be and easy to maintain.
Not aware of time until the last ten minutes, but prior to that it was a place of great contentment and i felt a SOLID AS A ROCK or that was the image i felt in my mind ... this feels soooo tight.
Access concentration... After listening to a Dharma talk by Leigh Brasington called instructions for Jhana 1 ... i maybe think that what i had was most likely a very pleasant 50 minutes of access concentration. It was so hard to leave, the only reason that i finished at the 1 hour mark was so as to enjoy my achievement with myself. Silly reason i know but go figure.
Nope. You were in samadhi. Way past access concentration. Your description of it confirms it (for me, at least).