Ooid

Ooids are small, spheroidal, "coated" (layered) sedimentary grains, usually composed of calcium carbonate, but sometimes made up of iron- or phosphate-based minerals. Ooids usually form on the sea floor, most commonly in shallow tropical seas. After being buried under additional sediment, these ooid grains can be cemented together to form a sedimentary rock called an oolite. Oolites usually consist of calcium carbonate; these belong to the limestone rock family. Pisoids are similar to ooids, but are larger than 2 mm in diameter, often considerably larger, as with the pisoids in the hot springs at Carlsbad in the Czech Republic.

Petroxestes

Petroxestes is a shallow, elongate boring originally found excavated in carbonate skeletons and hardgrounds of the Upper Ordovician of North America. These Ordovician borings were likely made by the mytilacean bivalve Corallidomus as it ground a shallow

Rogerella

Rogerella is a small pouch-shaped boring with a slit-like aperture currently produced by acrothoracican barnacles. These crustaceans extrude their legs upwards through the opening for filter-feeding. They are known in the fossil record as borings in

Gnathichnus

Gnathichnus is a trace fossil on a hard substrate formed by regular echinoids as they scraped the surface with their five-toothed Aristotle's Lantern feeding structures

Helicoconchus

Helicoconchus is a microconchid genus that occurs in the Lower Permian of Texas. It forms small reef-like bodies of tubes branching from a common origin. The impunctate tubes are greatly elongated for microconchids and have occasional diaphragms with

Bolboporites

Bolboporites is an extinct genus of conical echinoderms that lived in the Ordovician of Europe and North America. They are interpreted to have lived on the seafloor with the pointed end of the cone down in the sediment and the broad end upwards. A single

Logan Formation

The Logan Formation is the name given to a Lower Carboniferous siltstone, sandstone and conglomeratic unit exposed in east-central Ohio and parts of western West Virginia, USA

Ramonalinidae

Ramonalinidae is an extinct family of marine bivalve molluscs from the late Anisian. It was an edgewise-recliner with a flattened anteroventral surface and partially fused valves. They formed distinctive mud mounds

Aulopora

Aulopora is an extinct genus of tabulate coral characterized by a bifurcated budding pattern and conical corallites. Colonies commonly encrust hard substrates such as rocks, shells and carbonate hardgrounds

Thecideida

Thecideida is an order of cryptic articulate brachiopods characterized by their small size and habit of cementing their ventral valves to hard substrates such as shells, rocks and carbonate hardgrounds. Thecideides first appear in the Triassic and are

Delia Lyman Porter

Delia Lyman Porter was an American author, social reformer, and clubwoman. She was a prominent civic worker, associated with the prohibition and the parent–teacher association movements. Porter published books, calendars, short stories, compilations