About: Paleoshoreline

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A paleoshoreline (ancient shoreline) is a shoreline which existed in the geologic past. (Paleo is from an ancient Greek word meaning "old" or "ancient".) A perched coastline is an ancient (fossil) shoreline positioned above the present shoreline. Just off the coast of parts of North America, in the last 15,000 years sea level has varied from over 100 metres (330 ft) below, to as high as 10 metres (33 ft) above its present level. That entire time, humans have lived in North America. A lake may also have a paleoshoreline.

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  • A paleoshoreline (ancient shoreline) is a shoreline which existed in the geologic past. (Paleo is from an ancient Greek word meaning "old" or "ancient".) A perched coastline is an ancient (fossil) shoreline positioned above the present shoreline. Tides cause the ocean to advance and recede in a very short time scale, in most places about twice per day; weather conditions can also cause short-term variations. Coastlines can also move due to coastal erosion, without a change in sea level. But "sea level" refers to the average level over a relatively long period (years). This average sea level can advance and recede over much longer periods (thousands or millions of years), causing paleoshorelines which may be difficult to identify. Just off the coast of parts of North America, in the last 15,000 years sea level has varied from over 100 metres (330 ft) below, to as high as 10 metres (33 ft) above its present level. That entire time, humans have lived in North America. A lake may also have a paleoshoreline. Paleoshorelines have also been inferred on Mars; see Burgsvik Beds and Martian dichotomy. (en)
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  • A paleoshoreline (ancient shoreline) is a shoreline which existed in the geologic past. (Paleo is from an ancient Greek word meaning "old" or "ancient".) A perched coastline is an ancient (fossil) shoreline positioned above the present shoreline. Just off the coast of parts of North America, in the last 15,000 years sea level has varied from over 100 metres (330 ft) below, to as high as 10 metres (33 ft) above its present level. That entire time, humans have lived in North America. A lake may also have a paleoshoreline. (en)
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  • Paleoshoreline (en)
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