Dear Jan,

Can you tell about the theories which are using (gravity, tides,…)?…  What kind of tides?

Onto alternative theory of Earth-Moon Formation,-gravity… We can conclude that Earth is older than 4,6 years… example  7- 8 billion years… existed epochs with higher and other epochs lower like in actual tides… Another remark in your project can well use Lyell”s principle of actaulism… Example if you know how the hydrocarbon forming you will same resolve of your study purpose… Exist a good example hydrocarbon formed in Pannonian basin…

Best Regards,

Laszlo

This is much outside my expertise domain, but the first approximation seems quite simple. 

If you take the formula of the tidal force given by Rudzki (Fizyka Ziemi, Kraków 1909, p. 373), it depends on the Earth's and Moon's masses, Earth's radius and the distance Earth-Moon. The first three parametres should be the same in the Cambrian and today. As for the distance, Mietelski (Astronomia w geografii, Warszawa 2009, p. 280) says it grows 3-4 cm per year. So, 500 My ago the distance should be 5 x 108 x 3(4) = 1.5(2) x 109 cm = 15000-20000 km shorter. The present distance E-M is ca. 384 000 km, in the Cambrian the value is thus 0.948-0.961 of the above. The tidal force is inversely proportional to the cube of the distance, so 1/0.9483=1.174 or 1/0.9613=1.126. So I would say that in the first approximation Cambrian tides were 12-17% higher. 

Attention: I assumed that the radius of Moon's orbite grew linearly. Moreover, there should perhaps be some correction for faster Earth's rotation (420 days per year instead of 365)? 

But this may be a starting point.