Environmental factors for around 351 million years ago in the Voyage area
Black Rock Limestone (former name Lower Dolomite)
Thick bedded limestones, many of which are dolomitised (calcium replaced by magnesium).
Around 351 million years
Environment of rock formation
Open shallow shelf sea, with intense evaporation of sea water. Similar to Red Sea of today’s world.
15′ S of Equator
Oxygen as percentage of atmosphere
27% (21% today)
Carbon Dioxide as parts per million of atmosphere composition
450ppm (around 415ppm today and rising)
Maximum day time temperatures
Minimum night time temperature
Turbulence from surface storm waves
Sun high in northern sky
Earthquake risk (scale 1 low risk to 9 high risk)
Rheic oceanic plate undergoing subduction to south.
None in area
Crinoids, solitary corals and many strange sharks
On land plants spread creating new habitats
Days in year