Video | Business Headlines | Internet | Science | Scientific Ethics | Technology | Search

 


Ancient Forest Emerges From Beneath Takapuna Beach


Ancient Forest Emerges From Beneath Takapuna Beach

In recent days the sand near low water in the middle of Takapuna Beach, Auckland, has shifted and exposed the long buried remains of an ancient forest.

Many long-time locals say they have never seen it before, although some of the soft sticky mud that it is buried in has been uncovered in other parts of the beach on odd occasions in the past.


Auckland geologist Bruce Hayward visited the newly exposed fossil forest this week. “This is an exciting new discovery and is quite different and much older than Takapuna Reef’s famous fossil forest preserved in the lava flows from Pupuke Volcano”, he says.


“This new fossil forest consists of many small tree stumps in growth position in an ancient soil. It is clear that the trees became established on the surface of a thick white rhyolitic ash deposit, and in turn they have been buried and preserved by another thick creamy-white volcanic ash bed”. Similar thick rhyolitic ash and ignimbrite deposits occur in a number of low-lying parts of Auckland. Elsewhere they have been dated at close to 1 million years old and were erupted by gigantic explosive blasts from a volcano in the vicinity of Mangakino, near Taupo.

A similar sequence of white volcanic ash and peat occurs in Shoal Bay and was exposed a few years ago by earthworks when the Esmonde Rd interchange for the northern motorway was being enlarged. Similar aged fossil forests are permanently visible in eastern and southern Auckland in low sea cliffs at Pakuranga, Takanini and Waiuku.

“The fossil tree stumps and fallen branches and twigs are black, but they have not been burnt” says Dr Hayward, “instead they have been carbonised during their preservation and fossilisation. A specialist could study their cell structure and identify the kinds of trees present. Most of the trees are small and less than 15 cm diameter, but larger trees were in the neighbourhood as I found a large lump of kauri gum in the ancient soil.”

In places the volcanic ash has weathered to clays and is soft and sticky but in some places it has been hardened by remineralisation and some of these rocks stick up 30 cm above the present beach level.

History tells us that it will not be too long before the sands shift back and once again bury Takapuna Beach’s hidden secret – the oldest fossil forest on the North Shore.

Ends


ends

© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

Trade Agreements: TPP Minus US Starting To Gain Ground

The Japanese government is picking up the pace on reviving the Trans-Pacific Partnership trade and investment deal, with talks scheduled next month among the 11 countries left in the pact after the withdrawal by the US after the election of president Donald Trump. More>>

ALSO:

PACER:

Prices Up 2.2%: Annual Inflation Highest In Over Five Years

"Rising petrol prices along with the annual rise in cigarette and tobacco tax lifted inflation," prices senior manager Jason Attewell said. "Petrol prices in New Zealand are closely linked to global oil prices, and cigarettes and tobacco taxes rise in the March quarter each year". More>>

ALSO:

Undertaxed? NZ Income Tax Rate Second Lowest Among Developed Nations

New Zealand workers pay the second smallest portion of their income to the government among developed nations and less than half the average ratio of their Organisation for Economic Cooperation and Development peers. More>>

ALSO:

Cyclone Cook: Round Up Of This Week’s Weather

One of the significant impacts this week was flooding due to excessive rainfall amounts. Rainfall amounts topped out at 350mm over the past 60 hours in parts of northwest Nelson, with 200mm+ measurements recorded about Coromandel Peninsula, and between 150-200mm in the Kaimai Ranges. Rainfall amounts of between 30-50mm were commonplace elsewhere. More>>

ALSO:

Earlier: Batten Down The Hatches For Cyclone Cook

Although fast-moving, Cyclone Cook will be destructive and MetService Expert Meteorologists have issued Severe Wind Warnings for the whole of the North Island apart from Northland... More>>

ALSO:

Get More From Scoop

 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news