Great Unconformity
Which erosion histories produced the huge gaps beneath many younger sedimentary rocks?
Earth history
Missing rock, rising oxygen, abrupt warming and a changing Mediterranean: reconstruct Earth’s past from traces it left behind.
Subjects: Earth science · Climate and atmosphere
Problems in this collection
6 problemsGreat Oxidation Event
What controlled the rise and fluctuations of atmospheric oxygen about 2.4 billion years ago?
Paleocene–Eocene Thermal Maximum carbon sources
Which carbon sources triggered and amplified the rapid warming about 56 million years ago?
Messinian salinity crisis
How much water remained in the Mediterranean during the crisis’s final freshwater-influenced stage?
Mid-Pleistocene transition
Why did the dominant rhythm of ice ages change about a million years ago?
Dansgaard–Oeschger events
What drove Greenland’s repeated rapid warmings during the last ice age?