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Carbonates and Evaporites

, Volume 2, Issue 2, pp 149–155 | Cite as

Thrombolites of the lower devonian Manlius Formation of central New York

  • Kathleen M. Browne
  • Robert V. Demicco
Articles

Abstract

The Manlius Formation of the Lower Devonian Helderberg Group in central New York State contains decimeter-scale thrombolites. Internally, thrombolites comprise centimeter-scale, digitate to irregularly-shaped clots surrounded by skeletal wackestone. The clots are composed of variable amounts of: 1) millimeter-scale hemispheroids with radial and concentric structure that resembleKeega; 2)Renalcis-like forms; 3) stromatolitic laminae of mudstone; 4) peloidal mudstone laminae with filament molds; and 5) rare fossils. The thrombolites themselves are interbedded with grainstones, mudstones, graded beds, and intraclastic conglomerates. A low diversity fauna is found in many of these associated rocks.

Manlius Formation thrombolites are interpreted to have been rigid structures built by calcified cyanobacterial communities and encrusting and framework-building skeletal algae. Thrombolites are interpreted to have formed in a subtidal, restricted lagoonal setting. The low diversity of associated skeletal remains suggests that the environment was unfavorable for most organisms which would compete for space or consume the mound-building organisms.

Keywords

Mudstone Ordovician Stromatolite Grainstone Wackestone 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 1988

Authors and Affiliations

  • Kathleen M. Browne
    • 1
  • Robert V. Demicco
    • 2
  1. 1.Geology DepartmentSt. Lawrence UniversityCanton
  2. 2.Department of Geological SciencesSUNY at BinghamtonBinghamton

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