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Geologic time scale

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Geologic time scale.jpg Flying dinosaurs - PteranodonThumbnailsSketch of a gastrolith—the gizzard stone of an ancient reptileFlying dinosaurs - PteranodonThumbnailsSketch of a gastrolith—the gizzard stone of an ancient reptileFlying dinosaurs - PteranodonThumbnailsSketch of a gastrolith—the gizzard stone of an ancient reptileFlying dinosaurs - PteranodonThumbnailsSketch of a gastrolith—the gizzard stone of an ancient reptileFlying dinosaurs - PteranodonThumbnailsSketch of a gastrolith—the gizzard stone of an ancient reptileFlying dinosaurs - PteranodonThumbnailsSketch of a gastrolith—the gizzard stone of an ancient reptileFlying dinosaurs - PteranodonThumbnailsSketch of a gastrolith—the gizzard stone of an ancient reptile