Comment by jjk166

> Both warm-blooded dinosaurs and the Chicxulub impact were both theories dismissed as fringe for decades before overwhelming evidence led to them being accepted as likely. In no small way thanks to Jurassic Park.

The main rejection of the impact hypothesis was that the dinosaurs had already died off by the time of the impact, the idea that the iridium in the layer came from an impact was reasonably well received. In 1984 a survey found 62% of paleontologists accepted the impact occurred, but only 24% believed it caused the extinction. The Alvarez duo, who proposed the impact hypothesis, were proposing to redefine where the cretaceous ended based on a new dating method (at the time the end of the cretaceous was believed to be a layer of coal a few meters off from the now accepted boundary), and fossil evidence at the time seemed to show gradual decline. A big part of the acceptance of the theory was the development of new analysis methods that showed the evidence for a gradual extinction prior to the impact to be illusory. By the time the impact crater was identified, it was already the dominant theory. Actually in the early 90s major journals were accused of being unfairly biased in favor of the impact hypothesis, with many more papers published in favor than against.

Completely coincidentally, the theory that the chixulub structure was an impact crater was initially rejected and it wasn't until 1990 that cores sampled from the site proved it was.

Dinosaurs being warm blooded was well accepted by the late 70s.