Comment on: Delle Phosphatic Member: An anomalous phosphatic interval in the Mississippian (Osagean-Meramecian) shelf sequence of central Utah
Newsletters on Stratigraphy Volume 24 Number 3 (1991), p. 109 - 110
published: Jul 25, 1991
ArtNo. ESP026002403002, Price: 29.00 €
Nichols & Silberling (1990) tried to support their interpretation of the Delle Phosphatic Member as a shallow-water shelf deposit by their observation of endolithic trace fossils in phosphatic ooids. On the basis of thin sections through these ooids, they assumed an autotrophous producer with a close relation to the modern blue-green alga Hyella, which, as they claim, is restricted mainly to the upper photic zone. However, I seriously doubt whether their comparison is correct.