Plate 1. Foraminiferal test from sample 1215A_8H-03_60-62 showing evidence of early stage of diagenesis. A) shows a test of Cibicidoides dayi with the arrows pointing at the broken edge and peeling on the surface of the test. Under the light microscope, this test will appear glassy indicating good preservation. B) is a test of unidentified planktonic foraminifera with the outer layer of the test completely removed. It is difficult to identify this species because all the outer features have been completely dissolved. C) is showing a partially dissolved outer layer of B. tuxpamensis? It could still be identified based on shape and aperture position. D) is showing coccolith plates exposed by partial dissolution in T. selmensis test. Note (yellow arrow) how the nannofossil are arranged in different parts of the test with some sort of order. E) a piece of the foraminifera chamber is showing the peeling of the second layer of the test. The dissolution of this test has reached an advanced stage. F) is a test of O. umbonatus with the outer layer completely removed : The Impact of High Palaeoproductivity on the Ecological Function and Test of Foraminifera in the Equatorial Pacific Ocean during the PETM : Science and Education Publishing