T-rex or a nanotyrannus

[AranHao]

HELP! Please help me identify it.I am not sure it is t-rex or nanotyrannus .the tooth from  the Hell Creek Formation of Dawson County, Montana.  THANKS

Edited June 30, 2022 by AranHao
add something

[Troodon]

Need a locality, State and County where it was found. Indeed looks like a Tyrannosaurid tooth.

[Jared C]

If you don't know the specifics to county,  telling us the geologic formation it was found on will do as well. 

[AranHao]

6 minutes ago, Jared C said:

If you don't know the specifics to county,  telling us the geologic formation it was found on will do as well. 

the Hell Creek Formation of Dawson County, Montana. 

[AranHao]

17 minutes ago, Troodon said:

Need a locality, State and County where it was found. Indeed looks like a Tyrannosaurid tooth.

thanks your reply! The tooth from the Hell Creek Formation of Dawson County, Montana.

[Nanotyrannus35]

The shape of the base makes it seem like probably Tyrannosaurus.

[Troodon]

1 hour ago, Jared C said:

If you don't know the specifics to county,  telling us the geologic formation it was found on will do as well. 

Not necessarily especially from Montana where there are multiple adjacent Formations that contain Tyrannosaurids.  I've see many teeth identified from the Judith River Fm that were actually from the Two Medicine Formation and changed only when the locality was provided.  Locality is a must in any theropod tooth ID.  You cannot make the assumption the Formation indicated is correct. 

[Troodon]

1 hour ago, AranHao said:

thanks your reply! The tooth from the Hell Creek Formation of Dawson County, Montana.

 

Thank you.  Its a juvie dentary tooth of a Trex.

[AranHao]

7 hours ago, Troodon said:

 

Thank you.  Its a juvie dentary tooth of a Trex.

Thanks a lot. I have learned so much from you!:)

[AranHao]

12 hours ago, Troodon said:

 

Thank you.  Its a juvie dentary tooth of a Trex.

Excuse me again ~And may i know where is its position? (ex. I think it is the upper jaw and it is the incisor )

[Troodon]

I think its a dentary (lower jaw) tooth

[AranHao]

On 6/30/2022 at 11:18 PM, Jared C said:

If you don't know the specifics to county,  telling us the geologic formation it was found on will do as well. 

Could you give me your professional advice:) about the tooth (ex. The tooth from the Hell Creek Formation of Dawson County, Montana.)

[Jared C]

5 hours ago, AranHao said:

Could you give me your professional advice:) about the tooth (ex. The tooth from the Hell Creek Formation of Dawson County, Montana.)

My knowledge about Hell Creek fauna is maybe 1% that of @Troodon's. He's our go-to guy for Dinosaurs, so his ID will be correct.

[AranHao]

1 hour ago, Jared C said:

My knowledge about Hell Creek fauna is maybe 1% that of @Troodon's. He's our go-to guy for Dinosaurs, so his ID will be correct.

Thanks a lot !You both are the professional experts in this area!  Thanks again!

[AranHao]

@Troodon  Excuse me，You said it was a trex tooth ，the base side pinched in because it's being squeezed？Or is it something else ?

I know nanotyrannus teeth are pinched inward on both sides of the base.Waiting for your reply, thank you！

[Troodon]

First I'm not a professional expert, just a collector like you.  Bases of Nanotyrannus are rectangular and are pinched on both sides.

 

[AranHao]

2 hours ago, Troodon said:

First I'm not a professional expert, just a collector like you.  Bases of Nanotyrannus are rectangular and are pinched on both sides.

 

HaHaHa you have much more experience than me. I've only been collecting fossils for half a year.So to me, you're expert ! I was thinking that the root pinching forward is caused by geological compression, is that right？

[Troodon]

The root pinchs on your crown may be caused by the depression caused by the replacement tooth pit if its on the lingual side

[AranHao]

1 hour ago, Troodon said:

The root pinchs on your crown may be caused by the depression caused by the replacement tooth pit if its on the lingual side

Wow.Is this the tooth on the right side of the lower jaw? That makes sense

[Troodon]

Yes