Subject: Is gravity the same now as it was when dinosaurs were around?

I have read the archives before submitting this, the archives concentrate on 
the mass of meteors adding to the mass of the Earth.
I am wondering about the Earth's rotation slowing down.

I was wondering if anyone has been able to determine if gravity was the same on 
Earth before and after any giant meteor impact that could have wiped out the 
dinosaurs 65 million years ago?

The reason I'm wondering is that it would obviously be easier for dinosaurs to 
grow to the massive sizes they were if gravity was less back then.

It would also explain why no land animal has grown to such proportions since 
they were made extinct, particularly the large flying dinosaurs.

Just how big would a meteor hitting the Earth have to be, and where on the 
Earth would it have to hit to slow the Earth enough to make a difference to 
gravity?

Many thanks,

Keith

Re: Is gravity the same now as it was when dinosaurs were around?