Muchidimbu: Munguva yeCretaceous nguva, mhando shoma dzemasvosve ekutanga dzaive dzakapararira zvakanyanya paLaurasian supercontinent (kuNorth Hemisphere). Vaive vashoma kana vachienzaniswa nehuwandu hwezvimwe zvipembenene, vachimiririra chete nezve 1% yezvipembenene zvese. Masvosve akave akakosha mushure mekugadziriswa kwemwaranzi pakutanga kwePaleogene nguva. Pakazosvika Oligocene neMiocene, masvosve anga ave kumiririra 20-40% yezvipembenene zvese zvinowanikwa mumatura makuru. Zvemarudzi akararama muEocene nguva, ingangoita imwe chete mu10 genus inorarama nanhasi. Genus inorarama nhasi inosanganisira 56% yemarudzi muBaltic amber fossils (early Oligocene), uye 92% yemarudzi muDominican amber fossils (sezviri pachena early Miocene).
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