Environmental factors for around 187 million years ago in the future Bredon Hill area

Rock Name
Dyrham Formation (former name Middle Lias)

Lithology (appearance)
Pale to dark grey and greenish grey, silty and sandy mudstone, with interbeds of of silt or very fine-grained sand (locally muddy or silty).

Period
Lower Jurassic

How old
Around 187 million years

Environment  of rock formation
Silty sea becoming shallower over time.

Climate
Subtropical

Latitude
45′ N of Equator

Oxygen as percentage of atmosphere
20% (21% today)

Carbon Dioxide as parts per million of atmosphere composition
1000ppm (around 415ppm today and rising)

Maximum day time temperatures
29’C

Minimum night time temperature
12’C

Sea temperature
24’C

Weather risk
Seasonal storms

Midday Sun
High in southern sky

UV index
8

Earthquake risk (scale 1 low risk to 9 high risk)
6

Tectonic
Crustal extension due to opening Atlantic

Volcano risk
None in area

Top predator
Icthyosaurus

Animal Life
Pleiosaurus – Ichthyosaurus – bony fish – Ammonites

Plant Life
Cycads – Ginkgo – ferns

Humidity
High

Rainfall
Winter season high

Wind
SE?

Day length
23 hours

Days in year
385