Qeybtan hoos ku qoran ka dibna ka jawaab su'aasha ka dib luqadda la mid ah sida marinka: Passage: Discovery of Castorocauda lutrasimilis waa calaamadda ugu horeysa ee ah in qaraabada dhow ee naasleyda la qabsado biyaha ka hor dinosaurs lumay xukunka 66 milyan oo sano ka hor, dib u riixaya taariikhda lagu qiyaasay qaraabada naasleyda la qabsado hab nololeed semi-badda by 110 milyan oo sano. Iyada oo ku saleysan burburka la og yahay hadda, line naasleyda ma arki lahaa qaab kale semi-badda horumariyo ilaa Eocene. Sababtoo ah qaar ka mid ah haraagaha fossilized ayaa la helay, waxaa hore loo maleeyay in, ilaa Cretaceous <unk> Paleogene xadka (K<unk>Pg xadka), dhammaan naasleyda ahaayeen yar, dhulka ku nool ama geed ku nool, xayawaanka habeenkii la mid ah shrews, hedgehows, treeshrews, ama tenrecs.
xilligii Eocene