fossil ID. big bone(?) with "channels"

[luvmymushpups]

I found these 2 bones along the Yukon River in central Alaska. I'm not sure what part of the body they are. The d arker ones have "channels" at one end. they came from the area a am finding numerous bones from  

Edited August 26, 2023 by luvmymushpups
poor photos

[debivort]

I wonder if the channels are just how it happens to have weathered? Seems like we're mostly seeing the interior of the bone?

[luvmymushpups]

that

24 minutes ago, debivort said:

I wonder if the channels are just how it happens to have weathered? Seems like we're mostly seeing the interior of the bone?

thats what i was wondering also

[debivort]

I'm not at all certain. Hopefully others will weigh in.