The Megalosauripus tracks represent the oldest occurrence of this ichnotaxon and are attributed to large megalosaurid dinosaurs.
Six ichnosites of early Tuvalian age record mixed archosaur ichno-associations and the oldest occurrence of dinosaurs in the region.
The PA tephra occurs in ice-wedge casts and solifluction deposits, marking the oldest occurrence of permafrost in central Alaska.
For similarities with both qualitative and morphometric parameters of Megalosauripus uzbekistanicus together with the strong resemblance with the aforementioned Megalosauripus-like tracks, the Vale de Meios tracks are here assigned to Megalosauripus ichnogenus, representing the oldest occurrence of this ichnotaxon.
In contrast, the fossil records of mytilid bivalves at seeps from the Jurassic (150 Ma) and the oldest occurrence of Bathymodiolus species at seep sites from the upper middle Eocene (between 37 and 47 Ma) are earlier than the evolution of the larger whales [20].
The clitellate spermatozoa described herein thus constitute the oldest fossil animal spermatozoa yet recorded, predating the previous oldest occurrence (late Eocene [ 15]) by at least 10 Myr.
While no crown galagids are known from sediments older than the Late Miocene/Early Pliocene, the oldest occurrence of stem members of this family date back to the Late Eocene, when it is represented by two species found in the sediments at Fayum, Egypt: Saharagalago mirrensis (Fayum, ~36.9-42 Ma [ 39]) and Wadilemur elegans (Fayum, ~35 Ma [ 40]).
The Uraha Hill specimen is one of the oldest occurrences of the genus Homo, and it fills the geographical gap between sites of East and South Africa.
The oldest insect-bearing ambers extend only to about 130 Ma [74], effectively rendering older occurrences of fossils available only as compressions or impressions [ 35, 51] (but see [ 75]).
Further, as riders grow older, the occurrence of their reported Control Errors and Signaling Violations increased.
