{Prehistory Cycles}[26th October 1989]

[Redbook6:335-336][19891026:1454b]{Prehistory Cycles}[26th October 1989]

.1454

[continued]

The last mass extinction – of the dinosaurs – is reckoned to have occurred about 65 million years ago.*

2^26	=	67,108,864
	x	8
2^29	=	536,870,912	cf From start of Cambrian 570,000,000 [–] 65 [=] 505,000,000 [years]
	x	8
2^32		4,294,967,296	cf From crust formation 4,600,000,000 [years]

Formation of Earth’s crust c4,600,000,000 years ago.**

Precambrian age for 4,030 million years

to start of Cambrian 570 m[illion] years ago.

*See E[ncylopaedia ]B[ritannica] 19.810 &c

** E[ncylopaedia ]B[ritannica] 18.780

[continues]

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