It’s hard to tell. need pictures from other angles.

I would say this is absolutely not a tapir, but @smoran can better ID

this is a horse tooth. nice find Del!

Horse teeth have a funny way of doing that. the first time i saw a fossil horse tooth, i too thought it was wood, but this is a nice horse tooth!

I do not think this is sirenian. they do not have teeth of this fashion but it may be mammal. Perhaps seal tooth?

I agree with Victor. it’s hard to tell, but i’m not convinced it’s turtle only because i don’t see any sutures or sulchi on either side. The texture of the bone in the first image makes me think this is some type of mammal, perhaps part of the hip or scapula based on the shape and size.

could be part of a rib, closest to where it connects to the vertebra, but it’s hard to tell

the top one almost looks like it may be a toe bone, but it’s hard to tell. pictures of all angles, and a scale bar would be helpful, even if it’s just a pen!

Thanks MacKenzie!

I agree with James this is a crab claw

The bottom row look like horse incisors. The middle row may be horse or bison fragments.

Looks like an enamel shard of a mastodon tooth

Def looks like soft shell turtle frags

2 CT scanners?! Paleo heaven… do they have one big enough to scan skulls/jaws?!

Looks like it could be a tortoise spur

Based on the end that looks really solid, I would say it’s probably dugong rib. How long is it? And does it feel really heavy and dense?

Brown serrated piece at top right is a broken sting ray spine.

Oh my proboscidea! I MUST come visit now!

There’s the madera fossil museum that may be accessible to your area! I too am originally from the Central Valley as well