Environmental factors for around 183 million years ago in the future Bredon Hill area
Rock Name
Marlstone Rock Formation (previously known as Marlstone Rock Bed)
Lithology (appearance)
Sandy, shell-fragmental and ooidal ferrunginous limestone, interbedded with ferringinous calcareous sandstone.
Period
Lower Jurassic
How old
Around 183 million years
Environment of rock formation
Shallow warm clear seas
Climate
Subtropical
Latitude
45′ N of Equator
Oxygen as percentage of atmosphere
20% (21% today)
Carbon Dioxide as parts per million of atmosphere composition
1100ppm (around 415ppm today and rising)
Maximum day time temperatures
29’C
Minimum night time temperature
12’C
Sea temperature
24’C
Weather risk
Midday Sun
High in southern hemishphere
UV index
8
Earthquake risk (scale 1 low risk to 9 high risk)
6
Tectonic
Crustal extension associated with Atlantic opening.
Volcano risk
None in area
Top predator
Icthyosaurus
Animal Life
Pleiosaurus – Ichthyosaurus – bony fish – Ammonites
Plant Life
Cycads – Ginkgo – ferns
Humidity
Rainfall
Wind
Day length
23 hours
Days in year
385