这些足迹化石的发现填补了这一重要地区新近纪哺乳动物化石记录的空白。
These tracks fill a gap in the record of Neogene mammals in this important part of the world and contribute significantly to our knowledge of these faunas.
后来，他继续从事相似的工作，足迹遍布整个英国；与此同时，他不断研究那些新近露出的地层，并且收集所有能找到的化石。
He later worked on similar jobs across the length and breadth of England, all the while studying the newly revealed strata and collecting all the fossils he could find.
在犹他州和阿拉斯加州还发现了另一种鸟的“足迹”化石，但都无法追溯到白垩纪早期——恐龙时代的鼎盛时期。
Other bird "trace" fossils have been found in Utah and Alaska, but none from so far back as the early Cretaceous -- at the height of the age of dinosaurs.
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