Finalmente i Crinoidi sul Monte Generoso

Stefano Rossignoli 27 ottobre 2012

Splendide faggete del Monte Generoso
Splendide faggete del Monte Generoso

Ok, ok! I crinoidi del Generoso ci sono da un bel po’! Non certo da oggi!!!

Sono Crinoidi dei mari tropicali Giurassici.

In questo video girato sui ghiaioni del Monte Generoso, ho ripreso alcune lastre con piastre di crinoidi sub circolari o pentagonali. In passato mi era capitato di vederne anche a forma di stella a cinque punte.

Tutte le piastre sono forate al centro per consentire l’alloggiamento del sistema nervoso.

Pima del video avevo parlato inglese circa tre ore e il mio Italiano ne ha risentito un po’! Ho anche trasformato involontariamente il nome delle Stelle Marine in “stelle de mare”!!!!!

Comunque sia, buona visione!!!

Di nuovo sul ghiacciaio in Val di Rhemes (Video)

Stefano Rossignoli 18 agosto 2011

Una passeggiata sul ghiacciaio in modo da portarvi con me a vederlo, niente di più…

Crepaccio longitudinale sul Ghiacciaio della Tzanteleina
Crepaccio longitudinale sul Ghiacciaio della Tzanteleina

Una piccola gita tra funghi di ghiaccio, fori crioconitici, crepacci, bediere, laghi e morene.

Qualche breve cenno alle dinamiche dell’ambiente periglaciale (ovvero intorno al ghiacciaio) ed epiglaciale (ovvero sul ghiacciaio) con un particolare riferimento alla diversa fusione del ghiaccio (ablazione differenziale) a seconda della diversa copertura detritica.

Ricordo che il ghiaccio fonde, non si scioglie …anche se ogni tanto mi scappa la seconda parola, bisognerebbe parlare solo di fusione, ovvero del passaggio dell’acqua dallo stato solido a liquido. Sul ghiacciaio può avvenire anche sublimazione che è un’altro passaggio di stato direttamente da solido a gassoso…ma questo richiederebbe ben più di un articolo!!!

Soprattutto tanta emozione fin dalle prime luci dell’alba in un ambiente unico, solitario e selvaggio…

Se vuoi a questo link trovi uno dei primi articoli di scienzafacile dedicato ai ghiacciai: Cosa è un ghiacciaio

Sigla finale dedicata all’amica Elena, mia carissima musa delle montagne e delle cime…

Buona visione!

Un giretto al pal-vert-lab!

Stefano Rossignoli 27 luglio 2012

Cristina Lombardo e Claudio Garbelli al lavoro
Cristina Lombardo e Claudio Garbelli al lavoro

Oggi mi è capitato di dover fare un salto al pal-vert, uno dei laboratori dove per anni ho preparato fossili al Dipartimento di Scienze della Terra di Milano e ho trovato Cristina e Claudio che discutevano e lavoravano su un campione di scaglie di pesce fossile del Triassico superiore…

Cristina Lombardo
Cristina Lombardo

Cristina con le sue mani precisissime preparava il campione discutendo con Claudio che lo stava studiando, allora ne ho approfittato per scattare un paio di fotografie e girare un minivideo per aprirvi la porta ad un momentino di vita nel palvert…

Una macro sulle eccezionali mani di Cristina Lombardo
Una macro sulle eccezionali mani di Cristina Lombardo

Ed ora il piccolo video!

Buona visione. Chiarisco solo che quando Claudio finisce dicendo:”Proviamo con l’alcool” sta solo per applicare un velo di alcool etilico per aumentare il contrasto e quindi migliorare la visibilità del fossile al microscopio!!! Eh eh! Buon lavoro!!!

Grazie a

Dott.sa Cristina Lombardo

Dott Claudio Garbelli

 

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