Cambrian-Ordovician Climacteric
500 Million Years Prior to the Modern Era - A series of mass extinctions at the Cambrian-Ordovician boundary (This terminological appellate signifying the incidence of chronological interval extinction-related events) effectively compromised the population densities of numerous brachiopods and conodonts (nonexistent chordates possessing aesthetic commonality with eels) while decimating the trilobite species. The principal agent of causality correspondent to the aforementioned climacteric recognized as a severe fluctuation in atmospheric temperature gradient, effectively creating the necessary conditions for what would eventually become the first significant Ice Age.
Ordovician-Silurian Climacteric
440 Million Years Prior to the Modern Era - Widely acknowledged by numerous elements within the scientific community as having occurred in two distinctive chronological junctures during the Ordovician-Silurian transitional period. Each of the aforementioned events attaining precedence via the onset of temperature gradient fluctuations at the atmospheric level - eventually culminating with the process of hemispheric glaciation (A term synonymous with the Ice Age concept). The oceanic denizens populating the periphery of the geographical landscape were adversely affected by this drastic reduction in sea level, largely contributing to the first documented extinction event attributed to the Ordovician-Silurian transition. The second instance the resultant by-product of sea level elevation, an event whose occurrence was precipitated by the gradual increase in the acknowledged hemispheric temperature gradient. This exponential increase in sea level precipitated by the incidence of a massive undersea earthquake, a tectonically inspired anomaly generating a series of tidal disturbances.
Devonian-Carboniferous Climacteric
365 Million Years Prior to the Modern Era - Assumed a mantle of precedence during the course of transition from the Devonian juncture to the Carboniferous period of chronological sequence. It has been postulated by numerous experts in the field of paleontology that at the climax of this particular event that an estimated 70% of all species ceased to exist. The genesis of this particular climacteric the after effects of a massive cosmic gamma ray burst from within the periphery of the Milky Way galaxy.
Permian-Triassic Climacteric
Triassic-Jurassic Climacteric
Cretaceous-Tertiary - Climacteric
Extinction level events exhibit a cyclical pattern of frequency. Based on the most recent scientific research and investigative studies, it has been surmised that the incidence of this type of terrestrial climacteric occurs once every 26 to 30 million years. Several theories concerning the statistical relevancy of such cycles suggests that the incidence of these types of occurrences are the resultant by product of an unforeseen cataclysmic upheaval.
The following cinematic reference details the possibility of future extinction level events and the consequences of their occurrence:
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