The key difference between limestone and chalk is that the limestone contains both minerals, calcite, and aragonite whereas chalk is a form of limestone which contains calcite. Limestone is a type of sedimentary rock. It mainly contains different crystal forms of calcium carbonate. Chalk is a form of limestone.

Limestone is a very hard rock, so try and crumble it in your hand or fingers. If it starts to come off in your hand, then you don’t have limestone. It is very possible that if you have limestone you have something that has fossil imprints in it. See if you can spot any areas where marine life might have been.

Coquina is a sedimentary rock composed almost entirely of sand-size fossil debris. The fossils are usually mollusk or gastropod shells and shell fragments. Coquina contains very little silt or clay-size particles, and its fossil fragments are lightly cemented together.

sedimentary rock

igneous rock

Chalk is a limestone that consists of coccolith biomicrite. Most of the fossil debris in chalk consists of the microscopic plates, which are called coccoliths, of microscopic green algae known as coccolithophores.

The remainder of the Lower Chalk is argillaceous in its lower part (the Chalk Marl) and becomes progressively purer above. In the central Chilterns, the two parts are separated by the hard Totternhoe Stone, which forms a prominent scarp in some places. The Middle Chalk averages about 200 feet (60 m) in thickness.

Shaly Chalk. Shaly chalk is a micritic rock consisting of poorly lithified calcitic mud together with wide ranging amounts of allochems, organic matter, micrograined terrigenous detritus, and secondary minerals such as pyrite, hematite or limonite.

Chalk is a non-clastic carbonate sedimentary rock that is form of limestone compesed of the mineral calcite. It is soft, fine-grained and easily pulverized. Color is white-to-grayish variety of limestone rock. It is composed of the shells of such minute marine organisms as foraminifera, coccoliths, and rhabdoliths.

The term chalk in sports betting simply means that side of the bet is the favorite – usually a very heavy, or strong, favorite – to win that side of the bet.

Chalk: A favorite, usually a heavy favorite. Chalk eaters: Bettors who like to bet big favorites (often a derogatory term). Circled game: A game in which the sports book has reduced its betting limits, usually because of weather or the uncertain status of injured players.

In sports betting, picking the chalk or betting the chalk means betting on the favorites. Nevertheless, please note that the favorites tend to pay the least and the term “chalk bettor” often refers to inexperienced bettors or people who are desperately seeking any kind of money return.

Chalk in sports betting refers to the betting favorite, more often a heavy favorite. It can linguistically take many forms: “It was a chalky NFL Sunday” “You only bet chalk, you coward”

The term actually came from one of the oldest sports that people started betting on — horse racing. Decades ago, before tote boards with computerized screens to display the odds were developed, sportsbooks at the horse tracks (or bookmakers in back rooms) used chalkboards to display (and change) the odds.

noun. Street slang for Methamphetamine.

Definition of chaulk to be kissed by surprise.

‘Chalk it up is’ correct. It comes from using chalk boards to record scores or running tallies. A ‘chock’ is a small wedge used to stop something moving or turning.