I think an arrowhead would retain some of its texture where the rock was chipped away, so this is probably a rock, however this site may help more: https://classroom.synonym.com/tell-original-arrowheads-6566904.html

Ungulate tooth maybe? @matthew-gramling could help.

Possibly “Desert Rose” selenite crystals?

Possibly a crinoid stem fragment?

Sure, I think the scientific name is “Melopsittacus undulatus”.

Crinoids, I think.

Horn coral maybe?

Possibly a bryozoan imprint?

Brachiopods possibly?

Horn coral possibly?

Possibly some pieces of cidarid sea urchin tests?

@bill-heim

@bill-heim

@bill-heim

@bill-heim could help with this.

Seems to be a horn coral specimen.

Maybe some bryozoans?

@bill-heim could help.

Possibly a gastropod imprint in the top right specimen?

I agree with @leonardo-miranda and @matthew-gramling.