Because it wasn't always a desert. It could have been a swamp or forest at some point in the past. As the continents drift north or south, or mountain ranges rise and fall the weather will also change.
Kind of like when the Sahara desert was a savana grass lands and that was just within the last 5 to 10 thousand years.
I live in the middle of a continent and my whole area has coral fossils because it was once an ocean floor.
A leaf fossil could be found in a dry bare desert area if the environment was once wet and lush, and over time, due to geological changes such as shifting tectonic plates or climate change, the area became dry and barren. The leaf could have been buried by sediment and preserved over millions of years to become a fossil.
igneous..
leaf fall, or fall
In Sapphire you only can get one of the two fossils found in the desert. If you have a trade buddy you could trade over the fossil Pokemon from Fire Red/Leaf Green and the second one from Ruby/Sapphire. In emerald you get both Hoenn Fossils, but at different points in the game.
Acacia acinacea, also known as the round-leaf wattle, is found in the northern regions of the Tanami Desert.
This is not a fossil in leafgreen.
In Pokemon Ruby/Sapphire, fossils can be found in the desert north of Mauville. In Fire Red/Leaf Green, they are found in Mt. Moon. In these games, only one fossil can be taken. In Diamond and Pearl, fossils are found by digging in the underground- you can take as many as you find down there, and turn them into Pokemon in the coal museum.
It is formed slat rock and covered up with layers and layers of rock and sediment.
The leaf of the Sturt's Desert Pea averages 15 mm in length.
i think it would be a trace fossil.
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It is called Leaf-bare.