Difference between revisions of "AY Honors/Fossils/Answer Key 2/es"

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===Removal of delicate specimens===
 
For extracting fossils from harder rocks, a sturdy mallet and cold steel chisels may also be required. Usually one needs a range of chisels in size from small ones with a sharp edge of about 1 cm (quarter of an inch), to much larger and heavier chisels. A broad-bladed chisel is often very useful for splitting rocks along their bedding plane.
 
  
 
Different types of rocks will break differently and a beginner should put in a little practice, getting the feel for a particular type of rock before he or she starts hammering out fossils. It is all too easy to ruin a specimen with one ill-placed blow of a hammer.
 
Different types of rocks will break differently and a beginner should put in a little practice, getting the feel for a particular type of rock before he or she starts hammering out fossils. It is all too easy to ruin a specimen with one ill-placed blow of a hammer.

Revision as of 16:25, 25 February 2021

Other languages:
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Fósiles
División Norteamericana

Naturaleza


Destreza: 2
Año de introducción: 1944



Template:Division variant/es



IA logo.png
Conexión Logros para la Investidura: Esta especialidad está relacionada con los requisitos de Logros para la Investidura para EXPLORADOR Estudio de la naturaleza que requiere estudiar artículos que complementan esta especialidad. Esta especialidad es una elección popular para la especialidad de la categoría de Estudio de la naturaleza de nivel de destreza 2 o 3 requerido para los EXPLORADORES DE CAMPO Y BOSQUE.



1

Hacer una colección de al menos 10 diferentes clases de fósiles y etiquetar cada uno con su nombre y ubicación geográfica.


Fossils are found in many places where sedimentary rocks, such as claystones, shales, limestones, and sandstones, are exposed. Only certain sedimentary rocks harbored the appropriate environmental conditions to preserve and yield fossils, which are often concentrated along particular bedding planes within the rocks.

Finding Fossils

Fossils are generally found in sedimentary rock with differentiated strata representing a succession of deposited material.


2

Tener una breve definición de cada una de las siguientes en su libreta de notas:


2a

Geología



2b

Fósiles


2c

Catastrofismo


2d

Paleontología


2e

Graptolitos


2f

Trilobites


2g

Dinosaurio


2h

Mamut


2i

Mastodonte


2j

Crinoidea


2k

Lingula


2l

Calamites


2m

Foraminíferos


2n

Radiolaria


2o

Paleozoico



2p

Mesozoico


2q

Cenozoico


2r

Pleistoceno


2s

Paleobotánica


2t

Pelecípodo (bivalvos)


2u

Braquiópodo




3

Visitar un museo donde los fósiles se encuentran en exhibición y hacer un informe escrito u oral de su viaje.



4

Describir el proceso de la correcta extracción de los especímenes delicados. Decir cómo un esqueleto de un dinosaurio gigantesco u otros fósiles serían extraídos. ¿Por qué no debería principiantes extraer esos especímenes? ¿Qué trabajo debería ser realizado por el principiante cuando se considera que es evidentemente un fósil valioso?


Different types of rocks will break differently and a beginner should put in a little practice, getting the feel for a particular type of rock before he or she starts hammering out fossils. It is all too easy to ruin a specimen with one ill-placed blow of a hammer.

Extracting a specimen that is embedded in solid rock may prove to be a long and difficult process. Before attempting to extract a specimen, the collector should make sure that it is feasible to remove it without destroying or damaging it. Leaving sufficient rock beneath the specimen to protect it from fracturing; excess matrix can be trimmed at a later time.

For soft sediments and unconsolidated deposits, such as sands, silts and clays, a spade and a flat-bladed trowel or stout bladed knife may be the most useful tools for clearing the area around a fossil. Brushes are also useful for removing loose sediment from around fossils.

A sieve is used to separate fossils from sands and gravels. A smaller mesh is required in order to avoid losing small fossils. One practical difficulty with using sieves in the field is that they easily become clogged, especially when the material sieved has a high moisture content. However, under dry weather conditions the more durable fossils, such as teeth and bones, can be quickly and easily sieved out of loose sands. Shaking the sieve is always liable to damage or destroy fragile fossils.

If there is water available, such as on a beach or next to a stream, the material containing the fossils can be sieved wet and the matrix gradually washed away. Wet sieving is a technique that is frequently used for the collection of small mammalian fossils, and by using this technique even the smallest specimens may be recovered.

Removing gigantic fossils

Occasionally, large fragile specimens may need to be surrounded and supported using a jacket of plaster before their removal from the rock: This protects the fossil, protecting it from shattering. If a fossil is to be left in situ, a cast may be produced, using plaster of paris or latex - while not preserving every detail, such a cast is inexpensive, easier to transport, causes less damage to the environment, and leaves the fossil in place for others to enjoy. Subtle fossils which are preserved solely as impressions in sandy layers, such as the Ediacaran fossils, are usually sampled by means of a cast, which shows up detail more clearly than the rock itself.

Valuable fossils

If you find an obviously valuable fossil, you should contact a professional. It is too easy to ruin a fossil by attempting to remove it yourself. Leave the extraction in the hands of an experienced collector. If you find such a fossil on public land, contact the authority responsible for the land. The fossil belongs to them, and they have the right to decide what to do with it. To find a professional, contact a museum or a local university. If they do not have one on staff, they will be able to refer you to one.


5

Explicar la diferencia que los científicos dan de la presencia de fósiles en relación a los evolucionistas y creacionistas.


Evolutionists and creationists both agree that fossils are formed when a creature is quickly buried in sediment. They disagree on how long ago this happened. Evolutionists believe most fossils were made millions of years ago. Creationists believe that nearly all fossils were made during Noah's flood less than 10,000 years ago.


6

De la Biblia y los escritos de Elena G. de White, citar declaraciones para explicar el origen de los siguientes materiales:
a. Carbón
b. Petróleo
c. Fósiles
d. Caliza


De Historia de Patriarcas y Profetas, p. 98, 99
Por doquiera yacían cadáveres de hombres y animales. El Señor no iba a permitir que permaneciesen allí para infectar el aire por su descomposición, y por lo tanto, hizo de la tierra un vasto cementerio. Un viento violento enviado para secar las aguas, las agitó con gran fuerza, de modo que en algunos casos derribaron las cumbres de las montañas y amontonaron árboles, rocas y tierra sobre los cadáveres.

En ese tiempo inmensos bosques fueron sepultados. Desde entonces se han transformado en el carbón de piedra de las extensas capas de hulla que existen hoy día, y han producido también enormes cantidades de petróleo. Con frecuencia la hulla y el petróleo se encienden y arden bajo la superficie de la tierra. Esto calienta las rocas, quema la piedra caliza, y derrite el hierro.



Referencias