Positive and Negative Fossil of Boreosomus – Early Triassic, Madagascar This exceptional positive/negative fossil of the extinct fish genus Boreosomus dates to the Early Triassic, approximately 247 million years ago. Preserved in both part and counterpart, the specimen offers a rare and highly instructive view of the original anatomy. The fossil displays clear scale impressions and well-defined body structure, highlighting the characteristic morphology of early actinopterygian fishes that repopulated marine environments following the end-Permian mass extinction. Fine textural details and natural coloration within the matrix enhance both its scientific value and visual appeal. Collected in Madagascar, this specimen represents an important window into early Mesozoic marine life. A striking and authentic fossil, ideal for collectors, educational displays, or as a centerpiece in any paleontological collection. The lot includes plastic bases for display. Dimensions and weight of each part: 13.9 x 8.3 x 3.2 cm – 280g 13.8 x 7.8 x 2.3 cm – 190g