ImagingGeek,

Not defending Mansfield's Hypothesis but questioning your assumption that (surface) gravity could not have been less during the reign of the dinosaurs.

You gave a link-reference relating to pterosaurs and their ability to fly. What is your opinion concerning the Japanese scientist Katsufumi Sato, whose extensive study of modern sea birds leads him to conclude that pterodactyls were too heavy to fly. I assume his conclusion is based on the premise that gravity has been the same in the past.

Your other link about large dinosaurs seems to require a subscription to view the report. Any other references?

Laze