So when it comes down to our end cretaceous, we have seven left.

By the end of the Cretaceous, only large species of pterosaurs are known.

The group probably first appeared during the Jurassic and is well represented in Cretaceous amber.

They existed from the late Triassic to the end of the Cretaceous Period (228 to 66 million years ago).

It spanned the time between 145.0 4.0 Ma and 139.8 3.0 Ma (million years ago).

Climate During the Late Cretaceous, the climate was warmer than present, although throughout the period a cooling trend is evident.

Steneosaurus is an extinct genus of teleosaurid crocodyliform from the Early Jurassic to Early Cretaceous (Toarcian to Berriasian).

Its approximate time range is 113.0 1.0 Ma to 100.5 0.9 Ma (million years ago).

And that's what happens in an asteroid catastrophe, because that's what this was, of course. This is the famous K T.

Other studies, including molecular clock studies, have estimated the origin of the primate branch to have been in the mid Cretaceous period, around 85 mya.

In 1966, E. O. Wilson and his colleagues identified the fossil remains of an ant ( Sphecomyrma ) that lived in the Cretaceous period.

These rocks range in age from Permian (as old as 270 million years old) to Cretaceous (as young as 80 million years old.

Ants evolved from wasp like ancestors in the mid Cretaceous period between 110 and 130 million years ago and diversified after the rise of flowering plants.

Primarily growing in regions of warmer climates during the late Cretaceous period, vast fields existed in what is now Asia.

In 1990, working on the K T extinction for 10 years, I moved to South Africa to begin work twice a year in the great Karoo desert.

The main evidence of such an impact, besides the crater itself, is contained in a thin layer of clay present in the K Pg boundary across the world.

They range from 450 million years ago to the last, the K T, number four, but the biggest of all was the P, or the Permian extinction, sometimes called the mother of all mass extinctions.

Other research on Toxicofera, a hypothetical clade thought to be ancestral to most living reptiles, suggests an earlier time frame for the evolution of snake venom, possibly to the order of tens of millions of years, during the Late Cretaceous.

Across the sea in Germany, oil was found in the Wietze field near Hanover in 1859, leading to the discovery of seventy more fields, mostly in Lower Cretaceous and Jurassic reservoirs, producing a combined total of around 1340 m³ (8,400 barrels) per day.