All articles starting with F
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Fossil demosponges
Fossil demosponges are the remains of sponges of the class Demospongiae, the largest sponge class, preserved from the Ediacaran–Cambrian transition onward as spicules, fused frameworks, or organic molds.
Fossil Free campaign
The Fossil Free campaign is a climate advocacy campaign led by 350.org that calls on universities, pension funds, and governments to divest from fossil fuel companies.
Fossil fuel
Fossil fuels are nonrenewable energy sources, principally coal, petroleum, and natural gas, formed underground over millions of years from buried remains of ancient plants and animals.
Fossil fuel divestment
Fossil fuel divestment is the sale of financial holdings in companies that extract coal, oil, gas, and tar sands; by 2026, 1,731 institutions managing over $40 trillion had committed.
Fossil fuel industry disinformation
Fossil fuel industry disinformation is the spread of false or misleading climate claims by oil, gas, and coal companies, most extensively documented at ExxonMobil from 1977 onward.
Fossil fuel phase-out
A fossil fuel phase-out is the planned reduction and eventual ending of coal, oil, and natural gas use to cut emissions, distinct from a slower phase-down.
Fossil fuel power station
A fossil fuel power station, or fossil fuel power plant, burns coal, natural gas, or petroleum to generate electricity, supplying nearly 60% of global power in 2024.
Fossil gastropod localities and Lagerstätten
Fossil gastropod localities and Lagerstätten are deposits where snail shells, and sometimes soft parts and color patterns, are preserved far better than ordinary fossilization allows.
Fossil Group
Fossil Group is an American fashion accessories company founded in 1984, best known for Fossil brand watches and licensed watches for Michael Kors and Armani.
Fossil horsetails
Fossil horsetails are the preserved remains of the order Equisetales, jointed-stemmed plants known from the Devonian onward, whose extinct relatives included calamite trees up to 30 meters tall.
Fossil Muricidae classification
Fossil Muricidae classification covers how extinct murex snails are classified by shell characters, with about 1,200 fossil species known from the Upper Cretaceous to the Recent.
Fossil octocorals
Fossil octocorals: remains of Octocorallia (soft corals, sea fans, sea pens), about 3,500 living species with eight-fold polyp symmetry. Sparse Cambrian-to-Recent record of disputed forms like Cambroctoconus, Pywackia, spicules, and spiculites.
Fossil octopuses
Fossil octopuses are the preserved remains of extinct octopodiform and vampyromorph cephalopods, preserved by phosphatisation and known from Cretaceous Lebanon, Jurassic France, and Carboniferous Montana.
Fossil Podocarpaceae
Fossil Podocarpaceae is the fossil record of the podocarp conifers, preserved as cones and wood from the Early Cretaceous onward, when the family ranged far beyond its modern tropical distribution.
Fossil record and evolutionary origins of ascidians
The fossil record of ascidians is sparse, best known from the 500-million-year-old Megasiphon thylakos of Utah, which shows the modern tunicate body plan arose early.
Fossil record of chitons
The fossil record of chitons is unusually sparse compared with bivalves and gastropods, because their aragonitic valves dissolve readily, yet chiton-like fossils date back about 500 million years.
Fossil record of freshwater mussels
The fossil record of freshwater mussels covers extinct and ancient members of the order Unionida, bivalve molluscs confined to fresh water, with the oldest unambiguous fossils from the Triassic.
Fossil record of mygalomorph spiders
Fossil record of mygalomorph spiders: tarantula relatives known from Rosamygale grauvogeli (Middle Triassic, 242 Ma, France), Cretaceous Kachin amber Macrothelidae, and Miocene Megamonodontium; sparse due to burrowing habits.
Fossil record of mytilid mussels
The fossil record of mytilid mussels stretches from the Devonian, and possibly the Silurian, to the Pleistocene, with 58 fossil genera recognized despite poorly preserved, mostly toothless shells.
Fossil record of sea anemones
Fossil record of sea anemones (Actiniaria): exceptionally sparse because soft polyps lack skeletons. Key evidence includes Cambrian Eolympia pediculata, Ediacaran trace fossils, and Essexella from Mazon Creek, the only abundant fossil anemone.
Fossil scaphopods
Fossil scaphopods are the preserved tubular shells of tusk shells, marine molluscs known from the late Silurian or Early Devonian onward, with roughly 800 valid fossil species.
Fossil sea cucumbers
Fossil sea cucumbers are the remains of holothuroids, soft-bodied echinoderms known from the Ordovician onward, over 464 million years, mostly through microscopic skeletal ossicles rather than complete body fossils.
Fossil spider deposits and preservation
The fossil record of spiders, the best documented of any arachnid order, includes about 1150 species, dominated by Baltic, Burmese, and Dominican amber and rock deposits like Crato and Aix-en-Provence.
Fossil Trochoidea and Seguenzioidea
Fossil Trochoidea and Seguenzioidea are vetigastropod gastropod superfamilies whose fossil record runs from the Devonian, about 388 Ma, to the Pleistocene, classified mainly by shell characters.
Fossilized forest
Fossilized forest, or petrified forest, an assemblage of ancient trees preserved in growth position or as logs, formed by rapid burial and permineralization; examples include Cairo (385 Ma), Gilboa, Gallatin, and Axel Heiberg.
Fossilized Wonders (東方錦上京)
Fossilized Wonders (東方錦上京, Touhou Kinjoukyou) is the 20th mainline Touhou bullet hell shooter by Team Shanghai Alice, released on Steam August 16, 2025, featuring Reimu and Marisa, an eight Anomaly Stone equip system, and AI-generated background textures.
Fossis
Fossis, also Mansio Fossis, was a Roman road station and small harbor on the coastal via Popillia, identified with Corte Cavanella in Loreo, Italy, active from the 1st to the 5th century AD.
Fostamatinib
Fostamatinib (Tavalisse, Tavlesse) is an oral SYK inhibitor approved in 2018 (US) and 2020 (EU) for chronic immune thrombocytopenia in adults after prior treatment failure; stable response 18% vs 2% placebo in phase 3 FIT trials.
Fóstbrœðra saga
Fóstbrœðra saga, the Saga of the Sworn Brothers, is one of the sagas of Icelanders, telling of the sworn brothers Þorgeirr Hávarsson and Þormóðr Kolbrúnarskáld in Iceland's Westfjords and Norway.
Fostech Origin-12
The Fostech Origin-12 is a semi-automatic, gas-operated, magazine-fed 12-gauge shotgun built by FosTecH in Seymour, Indiana as an American-made alternative to the Russian Saiga-12, shown at SHOT Show in 2016.