Yes, you've already exposed me to your pet argument (see what I did there?) . Let's continue where we left off then:
Please justify your assertion that T. prorsus appears suddenly despite the gradual appearance of its suite of characters from the bottom to the top of the HCF?
Your last response on the matter was to present this quote mine:
Justatruthseeker said:
http://phys.org/news/2014-07-insights-evolving-triceratops-montana-hell.html
"The Hell Creek Formation contains lower, middle and upper subdivisions. When the team studied Triceratops skulls' morphology and position in the strata, they found that skulls showing only features of T. horridus appeared only in the lower section, while skulls exhibiting only T. prorsus featuresappeared only in the upper section."
Then I posted the very next sentence to expose your quote mining:
"Skulls found in the middle contained a combination of features of both species. The fossil record shows that T. horridusprobably evolved into T. prorsus over one to two million years".
And that was as far as we got. So please address the point made at the top of this post.