with multiple paired muscle scars from Lower--Middle Ordovician of Baltoscandia.
Knowing that the chambered shells represent cephalopods also helps us to interpret the ancient environments inhabited by nautiloids
. All cephalopods today require salt water to survive.
Breed, "The Discovery of Orthocone Nautiloids
in the Redwall Limestone, Marble Canyon, Arizona," in C.
cephalopod Cymatoceras hilli (Shattuck, 1903) from the Cretaceous (Albian) Walnut Formation, central Texas.
The color pattern on a Cretaceous Nautiloid
from South Dacota.
Reconstructing the life history of modern and fossil nautiloids
based on the nitrogen isotopic composition of shell organic matter and amino acids.
All of the hundreds of species of nautiloids
, except four species of Nautilus, disappeared as living things ages before man came into existence upon the earth" (193).
Among the fossils are a variety of creatures from sponges, worms and nautiloids
to solitary hydroids, also known as the flowers of the sea.
Fossils of nautiloids
(an ancestor of the giant squid) dug up during the building of the new centre are set into the floor of the building; a reconstructed Stone Age roundhouse sits on the site of a crannog (a prehistoric dwelling built on an artificial island in a lake); and the reserve's spectacular new glass-sided bird observatory sits above lime kilns that provided many of the bricks that built Belfast.
Then he witnesses the rise and fall of intelligent species in many worlds, including exotic hive minds, plant men, "nautiloids
," and intelligent stars.
The sandstone contains nautiloids
and abundant other mollusks.