Seaham

Permian rocks: (sequence)

Diagram: cross-section Permian strata

The Permian sequence in NE England  record changes in sea-level  within a regional, tropical sea referred to as the Zechstein Sea The cyclical changes in sea-level fluctuations are referred to as Zechstein Cycles Z1-Z5 The black arrows in Fig 1 from Tucker (1991) show the start and end of each cycle. Along the Durham coast […]

Permian rocks: (290-248 million years ago)

Table: Permian rocks 290 - 248 million years ago

The Permian rocks in NE England  record changes in sea-level  within a regional, tropical sea referred to as the Zechstein Sea The cyclical changes in sea-level are referred to as Zechstein Cycles Z1-Z5 Sea Level High When sea-level is high the Zechstein sea is filled with limey muds that turn to limestone over time = […]

The Durham coast during the Permian

Map: Late Permian

Zechstein Sea (25o million yrs ago) The Zechstein stretched east in central Europe and north towards the Panthalassa Ocean Source: BLAKELY (2014)

The Durham coast during the Permian (Marl Slate)

Reptile

The Marl Slate  (finely laminated shales) signifies rapid drowning of the Yellow Sands (aolian dunes) as the sea flooded in at the start of Zechstein Cycle 1 (Z1). Conditions in the lower water column were anoxic leading to amazing fossil preservation of  offshore, nearshore and terrestrial fauna and flora. Platysomus (shallow seas) Source: Tim Pettigrew

The Durham coast during the Permian

Map: Zechstein palaeogeographic

Zechstein Sea (250 million yrs ago) It formed two distinct basins north and south separated by the Mid North Sea high Source: Maurice Tucker 2016