The English version of Fossil was originally planned to be released around January 2000 (based on original Jungle estimates). But because Jungle was pushed ahead, Fossil was pushed ahead as well.
Wizards of the Coast once again increased the set size by producing holographic and non-holographic versions of the rare cards; however, they removed the Mew card that was in the Japanese set. Mew would later reappear as Wizards Black Star Promos #8 (non-holographic) and #9 (holographic).
Fossil completed the transition of the first 150 Pokémon (151 in Japan with the inclusion of Mew, whereas Mew would be a promo card in the English version) to card form. Base Set, Jungle and Fossil totaled 158 Pokémon, meaning 8 Pokémon were present in two expansions : Pikachu and Electrode were both in Base Set and in Jungle, while Gastly, Haunter, Magmar, Magneton, Raichu and Zapdos appeared both in Base Set and in Fossil.
The Unlimited Fossil release in Australia used red lettering for the word "Pokemon" instead of yellow on the Booster Box, Booster Packs, and Theme Decks. This was to help fight counterfeiting. Additionally all the non-holo cards (including rares) came with a 1999-2000 copyright at the bottom of the card. Note that holofoil cards pulled from these Red Fossil packs come with the standard 1999 copyright
The Prerelease cards for this set is Aerodactyl. There is a gold and a brown version. The gold version has a cosmos foil holo while the brown version has the standard galaxy star-patterned foil holo
Of all English-released sets, Fossil has the smallest amount of cards.
Like Jungle, this set provided evolutions of Pokémon introduced previously such as Hypno, Gengar, Sandslash, and Dragonite.
The Fossil set was the last set to use the galaxy star-patterned foil holo, as beginning with Base 2 (the set released after fossil) the holo pattern would change to the cosmos pattern. Note however there does appear to be some printings of unlimited fossil holos with the cosmos holofoil with a 1999 copyright (including zapdos), whether these were a test print run or an error print run is unknown.