There are none, because there were no mammals 200 million years ago. In fact we cannot tell if there were any mammals a million years ago. There are no fossils with mammary glands in the first place. In the second place there is absolutely nothing to show the gradual evolution of mammals. It is your side that has no proof and yes the absence of proof is proof of lack, a tremendous lack of facts supporting evolution.
Yes well luckily for us there are a whole host of skeletal features peculiar to mammals that allow us to determine whether a fossil was mammalian or not. The fact that these features are not only confined to, but are found in all living mammal species and all recent fossil mammal species makes it a statistical certainty that older fossil species possessing them were mammalian. If you don’t want to make the obvious inference, suit yourself. If we followed your refusal to make any historical inferences based on present day certainties, sciences like geology, cosmology, archaeology and palaeobiology would not exist. Doctors would be pretty snowed under if they couldn’t use a list of symptoms to make a diagnosis, but instead had to start afresh with each patient. “T,U, V, W, X, Y and Z are characteristic symptoms of disease A, and only disease A. We’re statistically certain that the illness is in fact disease A, but we cannot meet the absolute ironclad mathematical proofs required by the creationists, so we won’t make the diagnosis. Instead, we’ll waste time speculating that it might in fact be some disease we’ve never heard of.”