Context: The earliest known macrofossil confidently identified as an angiosperm, Archaefructus liaoningensis, is dated to about 125 million years BP (the Cretaceous period), whereas pollen considered to be of angiosperm origin takes the fossil record back to about 130 million years BP. However, one study has suggested that the early-middle Jurassic plant Schmeissneria, traditionally considered a type of ginkgo, may be the earliest known angiosperm, or at least a close relative. In addition, circumstantial chemical evidence has been found for the existence of angiosperms as early as 250 million years ago. Oleanane, a secondary metabolite produced by many flowering plants, has been found in Permian deposits of that age together with fossils of gigantopterids. Gigantopterids are a group of extinct seed plants that share many morphological traits with flowering plants, although they are not known to have been flowering plants themselves.

Question: When is the earliest known macrofossil identified as an angiosperm dated?
Answer: about 125 million years BP

Question: What is the earliest known angiosperm?
Answer: Archaefructus liaoningensis

Question: What pushes the age of angiosperm 5 million years further back?
Answer: pollen

Question: How long ago has circumstantial evidence has been found for the existence of angiosperms?
Answer: 250 million years ago

Question: What group of now extinct seed plants had many of the traits of what are now flowering plants?
Answer: Gigantopterids

Question: What is Oleanne, the earliest macrofossil, traditionally considered to be?
Answer: Unanswerable

Question: What evidence has shown that flowering plants existed 125 million years BP?
Answer: Unanswerable

Question: What has been found in ginko deposits of that age with gigantopterid fossils?
Answer: Unanswerable

Question: What do Oleanne share morphological traits with?
Answer: Unanswerable

Question: What are not known to have Permian deposits themselves?
Answer: Unanswerable