The discovery, designated Specimen GBS-117, on May 22, 2023, within a desolate gorge in the Gobi Desert, transcends standard paleontological classification. What began as a routine geological survey became an unprecedented re-dating of the Cretaceous-Paleogene (K-Pg) extinction event and a profound challenge to established ichthyological and avian evolutionary models. Embedded within a highly stabilized sandstone matrix—geochemically dated to approximately 66.5 million years ago, straddling the immediate aftermath of the Chicxulub impact—is the fossilized imprint of a colossal, ray-like creature, immediately dubbed the “Leviathan Pteranodon” for its staggering scale and morphological convergence with both deep-sea cartilaginous fish (Chondrichthyes) and mᴀssive Mesozoic flyers (Pterosauria). Preliminary field measurements indicate an approximate wingspan (or pectoral fin extension) of nearly 28 meters and a total skeletal length exceeding 35 meters. This gargantuan size is geometrically impossible under current terrestrial atmospheric pressures and oxygen saturation levels for sustained flight or even self-supported mᴀss, leading our team to propose the “High-Density Atmosphere Hypothesis” for the Late Cretaceous epoch, an era radically different from previous ᴀssumptions.

The morphological features of GBS-117 are even more destabilizing than its size. The skeletal structure exhibits a unique fusion of traits: the flattened, enormous pectoral fins and cartilaginous rib structure strongly suggest an adaptation for high-pressure aquatic life, mirroring modern Manta Rays, while the large, forward-facing orbital sockets and the highly articulated shoulder girdle scream of a predatory aerial existence. Dr. Li Wei, our chief paleo-anatomist, noted in his initial report: “This is not an evolution; it is a synthesis. The skull configuration, particularly the hyper-dense bone structure around the auditory complex, indicates a capacity for both deep hydrostatic pressure and supersonic air navigation. It is a creature equally adept in the bathyal zone as it is in the stratosphere.” Furthermore, the fossil is not merely a skeletal trace; sections of the wing/fin membrane retain mineralized impressions of intricate, fiber-optic-like vascular pathways, suggesting a mechanism for bioluminescence or perhaps, localized magnetic field manipulation. The implications are clear: conventional models of biological physics and atmospheric science must be drastically re-written to accommodate this organism.

This singular fossil provides a stunning, tangible bridge between deep geological history and the most pervasive human cultural narratives. The sheer, awe-inspiring scale of the Leviathan Pteranodon offers a scientifically plausible progenitor for global flood myths and legends of colossal sky-beasts or world-devouring ocean monsters—the Mesopotamian Tiamat, the Norse Jörmungandr, and the Aboriginal Rainbow Serpent. These myths, traditionally dismissed as allegorical human attempts to explain natural disasters, gain chilling authenticity when placed alongside GBS-117. Imagine early post-cataclysmic human societies encountering the decaying carcᴀss or even the rare, surviving descendants of this creature: a winged, serpent-like enтιтy capable of generating mᴀssive waves or obscuring the sky. We postulate that the sudden, violent geological and atmospheric shifts during the K-Pg boundary event—precipitating both global tsunamis and climatic chaos—might have driven a few surviving GBS-117 specimens into localized coastal areas, where their terrifying presence became permanently etched into the oral traditions of emerging civilizations, thus forming the primordial basis of the “Great Beast of the Deep” mythology.

The final and most sensitive phase of this study involves the analysis of trace elemental deposits found directly beneath the creature’s cranial cavity. These deposits exhibit non-terrestrial isotopic signatures, specifically an enriched concentration of $\text{Iridium}$ ($^{192}\text{Ir}$) not directly attributable to the Chicxulub impact, but to a secondary, unique event. This suggests that the Leviathan Pteranodon, or the materials it interacted with, originated from an external celestial body or was a product of highly targeted, pre-extinction ecological engineering. The fossil, therefore, is not just a scientific anomaly; it is an archetypal link connecting the deep history of Earth’s cataclysms with the universal myths of human ancestry, suggesting that our ancient legends are not metaphors, but flawed recollections of genuine, colossal, and terrifying biological realities. The Leviathan Pteranodon demands the amalgamation of Paleontology, Astrophysics, and Comparative Mythology into a single, unified field of study.