What are the salient features of Nerinea?

noun A genus of platypodous gastropods characterized by turreted shells in which the columella and inner and outer lips bear simple folds or corrugations which greatly contract the interior of the whorls.

What era was the Nerinea Trinodosa?

Jurassic
List of index fossils

What is the era of Nerinea?

Nerinea

What are some key index fossils?

There are some types of index fossils which include Ammonites, Brachiopods, Graptolites, Nanofossils and Trilobites.

What is the period of Nerinea?

Nerinea

When did the Nerinea live?

The conclusion is that nerineas lived on our planet during the Jurassic period, in the middle of the Mesozoic era, between 145 and 200 million years ago.

What are the three characteristics of a good index fossil?

A useful index fossil must be distinctive or easily recognizable, abundant, and have a wide geographic distribution and a short range through time. Index fossils are the basis for defining boundaries in the geologic time scale and for the correlation of strata.

Which is the best index fossil?

Ammonites
The best index fossils are common, easy-to-identify at species level, and have a broad distribution—otherwise the likelihood of finding and recognising one in the two sediments is low. Ammonites fit these demands well, and are the best-known fossils that have been widely used for this.

What do index fossils tell us?

Index fossil, any animal or plant preserved in the rock record of the Earth that is characteristic of a particular span of geologic time or environment. Index fossils are the basis for defining boundaries in the geologic time scale and for the correlation of strata.

What are the four conditions that must be met for a fossil to be an index fossil?

Are microfossils index fossils?

Such fossils are known as ‘index fossils’ or ‘guide fossils’. Geologists use both large fossils or ‘macrofossils’ and microscopic fossils or ‘microfossils’ as indices to define and identify geologic periods. Macrofossils have the advantage of being easy to see in the field, but they are rare.

Which fossil can be classified as an index fossil?

Trilobite fossils
An index fossil allows a scientist to determine the age of the rock it is in. Trilobite fossils, as shown in Figure, are common index fossils. Trilobites were widespread marine animals. They lived between 500 and 600 million years ago.

Where does the genus Nerine fit in the family?

In the APG IV system (2016), the genus Nerine is placed in the subfamily Amaryllidoideae of a broadly defined family Amaryllidaceae.

Where are fossils of Nerinea sea snails found?

† Nerinea is an extinct genus of fossil sea snails, marine gastropod molluscs in the clade Heterobranchia . This genus is present from the Jurassic to the Cretaceous periods. Fossils are known from various localities of Europe, Africa, North America, South America, China and New Zealand.

Where are the nerines found in South Africa?

Nerine are native to Southern Africa, their distribution range being from the Cape Peninsula in the south to Botswana, Lesotho, Namibia and Swaziland to the northwest and northeast of South Africa, occupying all nine provinces of South Africa.

What kind of growth pattern does a Nerine have?

Nerine species form three distinct growth patterns, namely winter-growing, summer-growing and evergreen species. While the flowers are generally pink, a red colour is an adaptation to a pollinator, the butterfly Aeropetes tulbaghia.