Theropod Dinosaur Guild Structure by Tom Holtz

[Troodon]

Tomas Holtz published this paper that looks at theropod assemblages in most of the faunas during the Jurassic and Cretaceous period.  You an take whatever you like from this document but what I found interesting was his presentation of the dinosaur communities (shown by sizes and which ones not present) in the different faunas (starts at line 1178) 

 

Examples below:

 

https://tspace.library.utoronto.ca/handle/1807/106039

 

I understand why he excluded Nanotyrannus but not sure why Troodon was not included in the HC and Lance.  He also excluded Zapsalis from the HC, JR and LC. good move since its not really valid.    Paronychodon or Richardoestesia isosceles were not listed, kind of understand because of the uncertainty around these taxons.