Environmental factors for around 420 million years ago in the Voyage area

Rock Name
Silurian rocks (grouping all Silurian age rocks to west of Malvern Hills together)

Lithology (appearance)
Olive green to grey silty mudstones, with calcareous (lime rich) siltstones, nodular calcareous beds and bentonites

Period
Silurian

How old
Around 425 million years

Environment  of rock formation
Shallow warm sea on continental shelf. Ash from distant volcanoes.

Climate
Warm settled conditions

Latitude
60′ S of Equator

Oxygen as percentage of atmosphere
17

Carbon Dioxide as parts per million of atmosphere composition
3300ppm

Maximum day time temperatures
24’C

Minimum night time temperature
15’C

Sea temperature
Warm

Weather risk
Occasional storms churning up sea floor.

Midday Sun
High in the northern sky

UV index
8

Earthquake risk (scale 1 low risk to 9 high risk)
10

Tectonic
Destruction of Iapetus Ocean to NW – Laurentian plate starting to override Avalonian plate depressing crust ahead of contact

Volcano risk
Ash falls and earthquakes – perhaps tsunami

Top predator
Sharks

Animal Life
Rich marine life

Plant Life
Primitive plans on some land areas

Humidity

Rainfall

Wind

Day length
21.1 hours

Days in year
414