...DAVID J. HILLS; BRIAN JONES Abstract Rhodoliths from the Late Pleistocene Ironshore Formation in the Crystal Harbour area on the western part of Grand Cayman, which are up to 14 cm long, are characterized by thick cortices that were constructed around nucleii formed primarily of coral or bivalve...

...Jennifer Vezina; Brian Jones; Derek Ford Abstract The Ironshore Formation (up to 19 m thick) in the Rogers Wreck Point area of Grand Cayman is divided into the unconformity-bounded units A, B, C, and D. The unconformities are highlighted by caliches and/or terra rossa. Th/U dates from aragonitic...

...Brian Jones Abstract Pleistocene limestones of the Ironshore Formation, deposited approximately 125 000 years ago, contain stellate tunicate spicules that are morphologically similar to those of the modern Trididemnum strigosum Kott, 1980 from Australia. The aragonite spicules, up to 0.1 mm...

...Brian Jones ABSTRACT Study of a caliche unit in the Pleistocene Ironshore Formation on Cayman Brac, British West Indies, demonstrates that plant roots and their associated micro-organisms played an important role in its diagenesis. The root borings, which are up to 25 cm in diameter and at least 4...

...Brian Jones; S. George Pemberton RESEARCH REPORTS 3 Lithophaga Borings and their Influence on the Diagenesis of Corals in the Pleistocene Ironshore Formation of Grand Cayman Island, British West Indies BRIAN JONES and S. GEORGE PEMBERTON Department of Geology, University of Alberta, Edmonton...

...Brian Jones; Robert W. Luth Abstract On the Cayman Islands, the Tertiary Bluff Group (Brac Formation, Cayman Formation, Pedro Castle Formation) is onlapped and overlain by the Pleistocene Ironshore Formation. On Grand Cayman, the Brac Formation and Cayman Formation are formed of finely crystalline...

...Brian Jones Abstract Phytokarst is spectacularly developed on the hard, finely crystalline dolostones of the Oligocene–Miocene Bluff Formation and to a lesser extent on the soft limestones of the Pleistocene Ironshore Formation on Grand Cayman. The black weathered surfaces, which are a reflection...

...Brian Jones; Q. H. Goodbody ABSTRACT Ooids in the Pleistocene Ironshore Formation of Grand Cayman Island generally have large nuclei and a thin cortex. The morphology, composition and texture of the nuclei suggest that they originated as pellets, proably from the burrowing shrimp Callianassa...

...Brian Jones; Cheryl A. Squair Abstract Spherical to elliptical peloids, averaging 80 mu m in length, occur inside plant rootlets that penetrate limestones of the Pleistocene Ironshore Formation on Grand Cayman. The peloids, which are associated with desiccated fragments of mites, are formed...

...Brian Jones; Kwok-Choi Ng Abstract Rhizoliths from the Pleistocene Ironshore Formation are formed of a brown micrite core surrounded by sediment that is well cemented with 1) calcite rhomb chains, 2) isolated calcite rhombs, 3) calcified spherical bodies, 4) Types I and II calcified epilithic...