Cambrian Stage 4 is the still unnamed 4th stage of the Cambrian and the upper stage of the 2nd Cambrian series. It follows the 3rd stage and lies below the Cambrian Stage 5. The lower boundary has not been formally defined by the International Commission on Stratigraphy yet. One proposal is the first appearance of two trilobite genera, Olenellus or Redlichia. Another proposal is the first appearance of the trilobite species Arthricocephalus chauveaui. Both proposals will set the lower boundary close to ~514 million years ago. The upper boundary corresponds to the beginning of Cambrian Stage 5 which also has not been formally defined yet. Proposals are the first appearances of the trilobite species Oryctocephalus indicus or Ovatoryctocara granulata, dated at approximately ~509 million years ago.
The International Commission on Stratigraphy has not named the 4th stage of the Cambrian yet. In the widely used Siberian nomenclature stage 4 would overlap with parts of the Botomian and Toyonian.
There's a figure of fear standing in the rain
Tell me why have you come back again?
Can't live in misery
And can't let anyone see
The fear finally peels away
But I feel like I'm dying every day
As the needle slides in, the pain slides out
A little less human, a little more doubt
As the needle slides in, the pain slides out
A little less human, a little more doubt
The peace of darkness surrounds me every night
When daybreak returns there's a life-crushing light
No reason to go on
Don't care if I face another dawn
No wish for me to remain
Just want release from this misery and pain
Can't live in misery
And can't let anyone see
No reason to go on
Don't care if I face another dawn
No wish for me to remain
Just want release from this misery and pain
The fear finally peels away
But I feel like I'm dying every day