Lower jaw

It's about two inches from the front teeth to the back

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Found this in the Imperial National Wildlife Refuge in La Paz County, Arizona, USA. It was on a mountainside right next to the Colorado River. I've never seen anything like it and I am hoping someone can identify it for me.

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... gas always diffuses from an area of high partial pressure to an area of lower partial pressure. Am I on the right track or does that seem too vague? ... their mouth and over the gill arches using coordinated movements of the jaw and operculum (gill covers) for the ventilation. Each gill arch has ...

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... its when I eat, sometimes its just there even if I'm not pressing my jaw together. And it only occurs on the left side of my lower jaw, around the corner of my mouth.

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... months ago I had an operation and was told I would lose feeling in my lower jaw because of it. Well, one half regained full feeling within a month but the other side still ...

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