Two in one post: possible Allosaurus tooth and Marshosaurus tooth

[AJ the Tyrant]

I’m wondering if these two teeth (both are from the Morrison Formation in Moffat County, Colorado) have been identified correctly as Allosaurus and Marshosaurus. Here are the measurements of both:

 

Allosaurus:

 

4cm long

 

serration count is 10/5mm on anterior and posterior carinae

 

base length is 21mm and base width is 13.5 mm (note from dealer: Please note that the base of this tooth is broken and the transition of enamel to root is not present.  The base measurement may have been larger.)

 

Marshosaurus:

 

4cm long

 

serration count is 18/5mm on anterior and posterior carinae

 

base length is 15 mm and base width is 8mm (note from dealer: Please note that the base of this tooth is very near the enamel to root transition a represents a fairly complete tooth.)

 

The serrations on the anterior keel of the tooth extend two-thirds of the distance from tip to base.

 

 

 

 

 

 

 

 

 

Images seem to be weirdly mismatched, but I think it’s pretty easy to tell which pictures match with which.

Edited February 23, 2022 by AJ the Tyrant

[Troodon]

I believe the first tooth is an Allosaurid.   I don't believe the second one is Marshosaurus based on the fact that the serrations density is the same on both carina.  Needs to be more dense on the mesial edge.   Possibly an Allosaurid.

 

When measuring teeth the crown height (CH) should be done as shown. 

 

.

[AJ the Tyrant]

28 minutes ago, Troodon said:

I believe the first tooth is an Allosaurid.   I don't believe the second one is Marshosaurus based on the fact that the serrations density is the same on both carina.  Needs to be more dense on the mesial edge.   Possibly an Allosaurid.

 

When measuring teeth the crown height (CH) should be done as shown. 

 

.

so the first tooth could be labeled Allosaurid indet. and the other theropod indet., correct?

Edited February 23, 2022 by AJ the Tyrant

[Troodon]

Yes thats ideal for the second one.  The first one could be allosaurus sp.