Was the average size of animals in the Mesozoic greater?

We all know the dinosaurs were big; presumably there were plenty of medium size and even small land vertebrates at the same time. But was the average (or mean) body mass of land vertebrates actually greater than in the Cenozoic? Or to try to state the question I’m wondering about more clearly, was the range of body sizes for animals about the same for animals up to elephant size, with the dinosaurs forming a super-heavy weight class that has no comtempory counterpart? Or were all the econiches filled by creatures substantially larger than todays- for example, 5000 pound allosaurs instead of 500 pound lions, or 60 ton sauropods instead of 6 ton elephants?