This area is on either side of the road, Bible rock proper is on the left side from the parking area, while a lot of other boulders are on the other side about 5-10 minutes walk.
Bible Rock is where I have experience and therefore that is what I'll describe.
The area is gritstone-esque with many little edges that crumble and break when used without caution. The bouldering relies upon good smearing technique squeezing features and big moves between good holds. Beware the topouts in general because many of them have scary downclimbs.
Bible rock is in 7 falls Park in Middle Hamden. From rt 9 take the Aircraft road exit. Take a right at the light onto Saybrook rd. Follow for about a mile and park is on the left after the powerlines.