Petroxestes is a shallow, elongate boring

Bioerosion

Bioerosion describes the erosion of hard ocean substrates – and less often terrestrial substrates – by living organisms. Marine bioerosion can be caused by mollusks, polychaete worms, phoronids, sponges, crustaceans, echinoids, and fish; it can occur on coastlines, on coral reefs, and...

 (a type of trace fossil

Trace fossil

Trace fossils, also called ichnofossils , are geological records of biological activity. Trace fossils may be impressions made on the substrate by an organism: for example, burrows, borings , urolites , footprints and feeding marks, and root cavities...

) originally found excavated in carbonate skeletons and hardgrounds of the Upper Ordovician

Ordovician

The Ordovician is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between 488.3±1.7 to 443.7±1.5 million years ago . It follows the Cambrian Period and is followed by the Silurian Period...

 of North America (Wilson and Palmer, 1988, 2006). These Ordovician borings were likely made by the mytilacean bivalve Corallidomus as it ground a shallow groove in the substrate to maintain its feeding position (Pojeta and Palmer, 1976). They are thus the earliest known bivalve borings (Taylor and Wilson, 2003). Petroxestes was later described from the Lower Silurian

Silurian

The Silurian is a geologic period and system that extends from the end of the Ordovician Period, about 443.7 ± 1.5 Mya , to the beginning of the Devonian Period, about 416.0 ± 2.8 Mya . As with other geologic periods, the rock beds that define the period's start and end are well identified, but the...

 of Anticosti Island

Anticosti Island

Anticosti Island is an island at the outlet of the Saint Lawrence River into the Gulf of Saint Lawrence, in Quebec, Canada, between 49° and 50° N., and between 61° 40' and 64° 30' W. At in size, it is the 90th largest island in the world and 20th largest island in Canada...

 (Canada) by Tapanila and Copper (2002) and the Miocene

Miocene

The Miocene is a geological epoch of the Neogene Period and extends from about . The Miocene was named by Sir Charles Lyell. Its name comes from the Greek words and and means "less recent" because it has 18% fewer modern sea invertebrates than the Pliocene. The Miocene follows the Oligocene...

 of the Caribbean

Caribbean

The Caribbean is a crescent-shaped group of islands more than 2,000 miles long separating the Gulf of Mexico and the Caribbean Sea, to the west and south, from the Atlantic Ocean, to the east and north...

 by Pickerill et al. (2001).

External links

• Bioerosion Website at The College of Wooster
  The College of Wooster
  The College of Wooster is a private liberal arts college primarily known for its Independent study program. It has roughly 2,000 students and is located in Wooster, Wayne County, Ohio, United States . Founded in 1866 by the Presbyterian church as the University of Wooster, it was from its creation...
  
  
• Comprehensive bioerosion bibliography